I just got my TT2 last night. Easy to install. Smooth spin and I like the quality of the big blue knob. Although it spins very smooth when installed, I could feel some grinding when I spun it in my hand. However, it did not move vertically, so it may just be the natural vibration of the bearings. There is no noise from it.
I did have some problems setting it up and using it in Mame32.
The spinner worked fine in Windows, but when I launched Mame32 and tried to map the dial control to Mouse2 X-axis, it would either accept it but not work in the game or freeze up Mame32.
The only way I was able to get it to work was by unplugging my PS2 mouse and rebooting with only the spinner attached. Then it worked fine. Weird.
I am not sure if it is a Mame32 issue (latest version 1.11), or an issue with the spinner's interface. I have been real pleased with the other products I have purchased from Groovy Game Gear, so I will have to tinker around with it some more.
I haven't looked yet, but I am hoping that I can wire in the Groovy Game Gear PS2 trackball to the Opti-Wiz board that came with the spinner. That way I only have to have one mouse on the system. That will probably help. I have two LCD Top Guns, but they don't seem to cause any conflicts.
Jeff