Nuru, my personal favorite is the Ingersoll-Rand line, but that's kind of like saying my personal favorite in tractors is Kubota. There's plenty of other good brands. What I have now is quite likely the most popular 1/2" impact wrench in existence (IR231). Most of the other companies do not make their own, they're made for them by Ingersoll, Chicago Pneumatic, etc. If you get one made by one of those companies, they come with an owner's manual that includes an exploded view and parts list, parts are readily available at reasonable prices if you DO break it (however, used properly and kept clean and lubricated, they'll probably last a lifetime with no repairs). The IR2131 (composite body - light weight - 450 ft/lbs forward and 600 reverse) has really gotten popular in the last few years as the most powerful 1/2" impact in the world, but like most products, they keep on coming out with new and better. I see in my new Craftsman catalog they have an "AIRCAT" that claims 640 ft/lbs (I never heard of them and don't know who makes them). Craftsman, MAC, Matco, Cornwell, etc. all have their own versions of the Ingersoll Rand with their own name and model number, but the parts are all the same (interchangeable). Snap-on makes some good ones, too, of course, but their parts are usually NOT interchangeable with the others, and are very expensive. When you shop for one, look at the ft/lb rating and the air consumption rating (scfm) to get one your air compressor puts out enough volume to handle. All of them I'm familiar with use 90 psi maximum. If you have an air compressor that puts out higher pressure, you'll get more power out of the impact wrench (and keep the air tool repair folks in business/w3tcompact/icons/wink.gif).