Watch TRON again as a comparison piece between the HT's.

Also for the drywall bits - I have never had luck with them either. I find it faster to just countersink manually with a regular bit rather than having to revisit each screw after the drywall bit failed to do its job. Maybe I've just never found a good quality brand/design?

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1