We have the Milwauke M18's on all the trucks at work with 7/16 quick change chucks instead of 1/2" heads none of them have had any troubles yet, the oldest one is probably 1.5 years old now. We've had 2 Snap-On lithiums for the last year, prototypes so they are a little different than the Snap-On Li being offered now, but I dont see anything to make the Snap on unit better. The batteries are hard to change compared to the Milwaukees, there heavier and we've had the bearings go bad on one unit. But like I said they were prototypes, I know they made some changes to make the batteries a little easier to change.