Have only had it for a week, but tested it out on several tires/valves and it locks on very easily and have 0 trouble getting a leak-free seal without even trying. Hardly any air escapes when attaching or detaching, which is more than I can say for the standard type chucks. The gauge responds very quickly and not having to hold the chuck in place on the stem is so much easier. Trigger and release valves both work smoothly and let you control the amount of flow easily. Overall very sturdy feeling. The weak point on any of these is where the rubber hose crimps to the metal fittings, we'll see how that holds up over time (probably best to not leave it connected and under pressure all the time, but that applies to any air hose). The rubber itself will eventually crack if you leave it out in the cold or direct sun, but probably not for many years. Actually they should sell a replacement hose/chuck assembly, I would have bought an extra just to have it. My old Husky one from Home Depot has had cracking rubber for years, the inside has a reinforced woven section and it does not leak, so that has been cosmetic only, I'm assuming this one (like any rubber air hose) is probably of similar construction, we'll see.I don't have a perfect reference gauge that I can compare to, but I have an old digital gauge, and both my cars have TPMS. I tested on my car that has been sitting (air in the tires was at a stable room temperature so no pressure fluctuation between readings. After running the built in calibration on my old digital gauge, it read 29.8 and 29.9 on my rear tires. This Nilight read 30.6 and 30.7. The TPMS in my car (which does not give decimal places) read 31, which means it is somewhere between 30.5 and 31.4. So as far as I'm concerned the Nilight is right within the accuracy range it advertises and more accurate than my old digital gauge. It also reads much faster than the old one and is far easier to see the readout. I also tested using a couple traditional pen testers and both showed between 30 and 32 (can't really get more accurate than that with those). I then bled both tires with the nilight to 30.0 and after backing out of the driveway (TPMS takes a minute to update) both tires changed to 30 in the car. So I'm confident in what is shown on the display. I'll do the same test on my truck next which runs 80 psi in the rear tires, see if I get similar results at the higher pressure, but no reason to think it won't do well there either. I'll also have to see if I can track down something with very low pressure and try with that too, but since I rarely need to fill anything less than my 20 psi wheelbarrow tire, not really all that concerned with whether it is spot on at 5-10 PSI or not.Got it for $18 and at that price it is a great value. Even at $25 to $30 would be very happy with it.It comes with the Industrial type air fitting pre-installed. So if you have an industrial or universal female coupler, you're good to go right out of the box. I found it to be leak free right out of the box (it uses an O ring instead of thread seal tape, and includes a couple extra O rings). It includes a large spool of teflon tape, I guess in case you need to switch it over to an automotive style fitting. Threads are standard 1/4 NPT so swapping the coupling is easy, though the O-ring seems designed for the included coupling and may not work well with others, hence the teflon tape being included I'm assuming. Also includes a valve stem core removal tool, and 4 stem caps (no cores though). I already have several core tools and cores from various tire repair kits, and honestly have never had to replace a core in my life, but can't hurt to have them around. The caps are always handy to have though, nice of them to toss those in as you never seem to have one when you need it. Couple generic AAA batteries included as well (not Panasonic as shown in the picture, but no big deal).On the topic of batteries, you'll notice that most low drain devices (this, TV remotes, etc) come with NON alkaline batteries. That is because Alkaline batteries, when not used enough, will leak, regardless of what brand they are. They also have a tendency to leak really bad when they are dead. If you do use alkaline batteries in this, remove them if you won't be using it for a while. But better to just buy a pack of Carbon Zinc (non alkaline) batteries for use in all your low drain devices (remote controls, etc). Will save you headache in the future. You can get no-name brands cheap at the dollar store or harbor freight and even some grocery stores, and generally they are perfectly fine quality, but you can find Panasonic Carbon Zinc batteries (called Super Heavy Duty) on Amazon and other places and I'd trust those a bit more. They last a really long time in remote controls etc and are far less likely to leak (still make sure you replace them when they die though as that's when any battery tends to leak badly). Rayovac and Eveready make them too, quality wise those are in between the no name like Sunbeam and the Panasonic.
