I've always used Bosch with good results. We used them in our woodworking shop. I have the 18 volt lithium now, started out with the 7.2 volt cordless back in the '80's.
I have noticed that the chucks don't hold as well as they used to so I don't know if the quality is suffering or what. Also, the last impact I got didn't even have a bit holder on it, pretty disappointed in that as they are pretty handy.
