I have a Ryobi with a Jacobs chuck, works good, but, the chuck rattles loose on bigger/multi-hole jobs. At work I have a Bosch and a couple Milwaukees with SDS plus chucks. Work great and bits stay tight. For the monster jobs, we break out the big Bosch with the SDS max bits. All of the above are at least a doxen years old and have plastic or metal cases.