Quote Originally Posted by ga-hvac-tech View Post
Update... finally had time to do some online research... came across this item:

http://www.amazon.com/Bosch-RH328VC-...=bosch+rh328vc

Anyone have experience with this drill?

THX in advance for any posts.
That is an SDS-Plus drill, and it will do more work than a regular SDS drill.

Still no comparison to a spline drive or hex shank rotary hammer.

If you plan to cut through 4" of concrete more often, or want to cut 4-1/4" holes in concrete with a percussion coring bit, then you want spline drive.