The dynapact is promising, and may be what i get anyway, but i personally like the "all-in-one" approach; a ratchet that will hammer the nuts off anything I want. Though the dynapact says 60 degrees, versus my dad's claimed 10-15 degree (a nitpick, but something to consider if short throw is a factor), I hope that it can drive off anything I put it to, 737 ft lbs is a fair bit, but may not be enough, I'll have to look into that.
My primary use for it is to remove the lug nuts on my truck. 6 lug Budds request 500 ft lbs torque to install, and a blowout on the road leaves me SOL. I tried using a 3/4 ratchet with a 4 ft cheater, and I got nowhere. It would also come in handy on my backhoe and Allis Chalmers tractors, and any mower decks using a single mounting nut/bolt.
Mostly I want to know what to look out for, so I may get it for future use.