Tuning in Buffalo. Innovative Tuning. I was going to tune my car there (seeing that it's like the only dyno that lets you rent it to tune yourself in the area), but by the time I get things in order I'll have moved far away :/
But I have yet to read ANY negatives about them. Granted I've only heard about them from NYSpeed.com, and didn't do a whole bunch of research (since I'd be tuning my car myself), but I didn't see a single bad word about them. YMMV