I ran the new Quantom 2 at Cleveland (and a week of practice and club racing) and was really happy with it. I have also always been happy with my Q1's. I think hara also has them rebadged under his name as well.

I think Mike Dunnigan runs a Keyence and Alex Lopez used to, and I have heard great things about them.

the GT7 is large and also you have the thing that they solded onto the wires that if you want a clean look you have to remount onto the speedo case itself (it takes around 15-30 minutes). However, they have been making prototype esc's and sending them out to all of their factory drivers. At cleveland everyone from Blackstock to Kinwald had them in their cars. Also Pudge had one in his xxx4 at the worlds (and probably in his reflex 12 and xxxs at cleveland, but i didnt see his car up close).