Yeah, I just posted that. I own that set, it's the best tornado attack set I've seen, and that is the best price I've seen, and an absolutely incredible price all around.
It comes with a Black Grip and a Blue Grip, WITH rubbers which you can swap around. I actually like it swapped, with red rubber on the black one and black rubber on the blue one, but either way is nice.
I'm actually considering getting one for my birthday, but I'm going to hold off as I want to give others a chance to own a Tornado Attack, for the sake of the plastics metagame :3
By the way, if you guys do buy these, I would suggest reinforcing them before you use them as the plastic is quite thin and they aren't easy to replace. Electrical Tape on the underside of the corners at the very least, if you can use some kind of filler (I'm going to use some expanding foam to reinforce mine). It'd also be cool if you guys chip in with testing or thoughts once you have that stadium and some good beys to use in it, but no pressure. Best stadium ever made though.