I've got it in my cart at totally wicked. Just don't know if this thing is any good or not, and I've got 20 minutes to decide on their crazy revolving sale. I like the ego, but I'd be interested in something a little more powerful. No way can I afford something like Provari or Darwin. Basically I want it to be simple and powerful. Would you guys say this screwdriver thing is it, or am I better off with another model? BTW, can I even use my 510 cartos with this thing, or is it different altogether? Thanks so much for the quick help! Really appreciate it!