800W/110V Variable Speed 4'' Wet Polisher / Grinder & Granite Diamond Polishing Pads Concrete Polisher Stone Polisher for Granite/Marble/Concrete/Stones

So far so good.I'm using this to polish rocks & geodes for lapidary.Helpful tip: The 90 degree water valve was not working at first. I couldn't seem to figure it out. What I ended up doing is loosening the threads right where the water valve meets the machine and bingo - water started coming out. Then you can tighten the nut and you're good to go. I guess I had the valve too tight. But it's all working great now.

I qualify my review by the fact that I am neither using the water attachment, nor the top handle.So far. I haven't bothered to use the water attachment feature. This is in part due to being in the middle of home remodeling, and without a reachable water faucet until the plumber is done. In part due to my being easily confused and [possibly wrong on my part], attaching the hose contraption seemed a bit more complicated than just screwing it on like a garden hose. Mostly, because I see no need as long as one manually wets the surface being grinded, and keeps it moderately wet throughout the grinding and polishing.I couldn't [readily] get the top handle attached, because the release screws [for attaching such] were too tight on the grinder. I decided to give it a go without the top ... I was being lazy and impatient.For softer material (e.g., marble), or deep and controlled, isolated cuts, it will be more important to attach the top handle for greater stability. Nevertheless, since my immediate project involved grinding and then polishing the complete inside surface of a basalt kitchen sink [basalt is harder than granite], working without the top handle was fine. The tools size and ease of use allowed me to retain a smooth surface and gradation throughout.The pads included, with all their ranges, worked great for all my needs (including my adding stone polish when using the highest [finest] pads. I began with the lower needed [rougher grit] pads to grind out the uneven chisel marks I made when I cut the sinks drain hole via another - diamond bits - tool. Then. I switched to the increasingly finer grits [higher numbers] that came with the product -- until the surface was smooth and even. I was then able to finish with stone polish and hog's-hair buffing pads -- which the tool easily accomodated.The pads I used are still in good shape, so I will be able to reuse them for future projects.Changing the speed on the tool is easy. Its size accomodated the small space inside my sink [most other grinders would not fit]. It was easy to angle, and even to switch hands, as I made my way up the curved sides of the sink. I needed to be careful to not let the edges of the pad grind little scratches at those curves with diameters smaller than the pads, themselves. Due to the tools maneuverability, I could ensure this with little effort.16 hours of grinding and polishing, and the tool and pads are still doing great. When I start using it for planned sculpting projects in the future, I'll post additional info if I find any weaknesses due to longer use (but, based on my initial experiences, I expect it to continue its good performance).The items were packed and shipped well.

So, lets open with if you need the tool, then you need the tool. If you're a contractor, it's probably a good idea to look at something else. If you're like me, and you're just going to use it a few times, it will likely be fine, but there are some really obnoxious issues.Before we get to the bad, the good. I've seen people complaining about the on/off switch. This is a feature, not a bad thing. Having the switch at the bottom of the devise in conjunction with the rubber guard allows you to better keep water away from your electronics. This is ultimately why I chose this product over the other options.Starting with the most obvious issue. The written material above says the grinder runs from 500 - 4000 RPM. The documentation says 1000 - 4000 RPM. I pulled out my laser tach and in reality it runs from 1100 - 3750. My understanding is these polishing pads aren't supposed to exceed 4,500 RPM, so this 3750 is probably fine (and within a proper margin of error for something like this IMO), so if you're depending on that 500-1000 part, you'll be disappointed. This was not a deal breaker for me.My biggest issue is this. Every angle grinder I've ever had a button that you can use to lock the gear box to allowing you to grab on to your pad and unscrew it. This product instead utilizes a wrench to keep the shaft from turning. Which is fine IF you're using the guard that it comes with. My issue with that is the guard it comes with isn't particularly useful. I wanted to use my own guard, which fully wraps around the whole grinding surface and has a shop-vac attachment. However, once I did that, I no longer have access to the the part of the shaft where the wrench needs to be placed. So once the polishing pad gets tightened by using it, it will be unremovable. Which is a serious serious bummer.Now, I'm not going to return it, I have 2 small jobs to do, and it will accomplish those jobs. When I did the counters in my bathroom I used a regular angle grinder running at like 11,000 RPM with a spray bottle, and I ended up with gouges and burn marks in my concrete. So if you're like me, it will be fine. If you have any intention of using this tool for years, I think I'd look at something else.Update: Okay okay okay. I actually used it for the first time this morning, and a couple of things. I've increased my ranking from 2 to 4 stars, and while I still hold by everything I said above, there were a few things I missed. A) the lock in most angel grinders is in the same place where the water comes out of in this angel grinder. So to have a lock it either would have been in another place, or the water would have to be distributed another way. Either of those things are possible, but lets keep in mind that this isn't a $500 tool. B) when I was using my regular angel grinder it would become bogged down under all that friction, especially with the finer polishing pads. This tool doesn't do that, it's got the torque it needs. C) the shroud I was all bummed I couldn't use that completely surrounds the grinder.... well it completely surrounds the grinder.... which means you can't get into corners or up against walls, so it's not actually useful, and you might as well use the supplied shroud to try and keep the splatter off the walls and call it a day. If I was building my counter top in the garage and moving it into position, I might be more irritated about the shroud thing, and I'm still a little annoyed in concept, but in practice it has laid my concerns to rest.