Just last week I reviewed this stapler on my blog. It works very well, and the fact that it is oil-less is a real boon. According to the specs it only has two moving O-rings, cutting down substantially on parts wearing down. It does not have an adjustable air exhaust, but that is not a big deal for me. I am impressed by the five year limited warranty. If you are in the market for a heavy-duty 1/4 inch crown stapler, this guy has your name all over it.