For the price, i think this kit is a great value. I won't be using these things hard core, will mainly be for lawn mower/trailer maintenance. I tested it out right after buying it to remove an old mowers blades and spindles and replace both. The bolts were very corroded. The impact wrench broke loose the big nuts holding the blades on just fine. I was actually surprised, as I hadn't been able to break them loose using a hand wrench. The bolts holding the spindles on, were all oxidized into the aluminum housing, but the impact wrench actually broke the heads off the bolts so I could remove the old spindles, which is a good thing.... so it seems this impact wrench does have plenty of power. I used the air ratchet in this kit to put all the bolts/nuts back in place and it worked fine too. I tested out the air hammer in the kit to chisel away all the crude built up on the mowing deck. It worked great and had a good range of adjustment in the speed/power of the chisel. I tested out the grinder by sharpening the new blades. It also worked fine. So, given the price range and all you get in this kit, I'm very happy with it. Can't speak to how long it will hold up, but given the fact I will use these things pretty infrequently, I suspect it will last me years.