From what I have read and seen here and there, I think most of the complaint's are coming from the newbie's who can not walk and chew gum at same time, buying this piece of equipment and hooking them up wrong, blowing the seals on them right away, and trying to claim faulty device...
I know of a few people who have JBJ and Milwaukee, and both work equally well.
So one should consider the source!

I will be buying another again one day within near future, probably another Milwaukee..
My $0.02