I saw Donkey_Kong did a review, including the wheel attachment, but I didn't want to tag on to his thread.
I've always been kind of disappointed with my original SS spinner. I love the feel of the weight, and it's spin - but the resolution just doesn't cut it. My old dell mouse has a greater resolution. So, last week I ordered a TT2. I ordered on Saturday, March 1st, it went out the following Monday, and I got it around Thurday or Friday. Good timing.
Instructions: pretty complete in description, as well as some figures for reference when connecting things up. There wasn't a lot on the mounting of the board except a caution to keep it free of anything metallic if let loose. I'll come back to this in the installation part.
Installation: the spinner, itself, was pretty easy. Tightening it down was a little difficult as there isn't much to grab onto, especially with the room afforded in a wire-infested CP. I ended up using two sets of plyers - one (carefully) on the spinner housing, and the other tightening the nut. An 'oh my gosh' after the fact: I suggest removing the top so you can push against top of th spinner housing underneath. The next part was the board. It's nice the mounting hardware is included. However, the holes in the board are diagonally across from one another, and one of them is only a half hole. (The board can slip in and out of it untill you get it tightened down.) The other thing is the tubular risers included. It all got a little much for me so I just used some adhesive velcro.
Performance: I had tried one of these before in someone's cabinet. They had the token top knob and that seemed to be heavy enough. I planned on using my SS top. I did try the stock top out, though, and it was hard to control, even with the sensitivity set way down in Tempest. I went to put my SS top on - and it didn't fit. I guess the SS shaft is slightly thinner. I went ahead and pushed a little (and it wouldn't go down all the way) to get it to sit so I could at least try it. This was better, but not as good as the one I'd tried with the token top. I realize now they might have had the resistance set a little on it. Still, it's a very nice difference. Of course, I had to change the sensitivity in games. Tempest I normally run at around 100. For the TT2, I had to bring it down to 36. Even so, I had to change my strategy in Tempest: especially on 'straight' levels, I was able to just hold the fire button down, and use less movement or just stay put in places and get the 'autofire' going. It took a little more concentration because I had to be more relaxed with my hand. And without a bottom weight it wouldn't spin endlessly so getting way around the other side of a shape or to the either end of a straight level was different. You have to move it there vs just spin/let go/stop. I don't have a wheel so I use my spinner for Pole Position. I normally run at 70 and had to adjust down to 11 (!) . The response is greater which means less sliding on hard turns but overall it's still a little tricky and something I'm getting used to.
Conclusions: a nice spinner. As has been mentioned by Randy, it's probably best with the token top knob for it's resistance effect. Either that or add an energy cylinder. Simply for mounting's sake, I wouldn't ask to redesign the board. But If I were anal about it, and I were the designer, I might rethink that part.