Mine's a Turbo Dynamics hybrid, the MD445.
I love it, instant kick of torque that makes the car scrabble for grip with no lag whatsoever. The car just gets up and goes.
The key is in the map imo - I asked Bill (Badger5) to make it as aggressive as possible which is just what I like. I've been out in others (without rods) with more mild, progressive maps that didn't impress me so much.
It's enough power for a small little hatch but given that I've gone to the trouble of rebuilding my engine and gearbox with uprated components I will probably investigate BT next year, time will tell...