Over the past 7 or 8 years I've tried about 5 brands of 3/8" corded VSR drills in everyday commercial use and the chuck tends to go first. ... This is an exact replacement for my previous R7001 which failed after 2.5 years of heavy use solely because I had connected it to 220/240VAC (not on purpose of course). It was in good condition including the cartridge. However, quality comes at a price and it's a bit heavy, but those are the only reasons it didn't get 5 stars.