I have the Mega-Combo as well, but never can go without my c-wrench. There's always some gorilla that has gone before me and over-tightened some bolt. I also bring along my lightspeed wrench when doing large hangs as it tends to speed things up. I find it unnecessary at times that I only have a few fixtures or maintenance.
Until the price comes down, I'll be avoiding the ultimate focus tool.
Until the price comes down, I'll be avoiding the ultimate focus tool.