I've tried one.. Heres my take:
With a 3 port .28 motor on 30% O'Donnell,
The motor immediately required richening with the belt driven blower and 50% overdrive pully. But it was not blowing fuel out of the exhaust. The idle was unbelievably strong and steady. I ran it on pavement in a 14lb XTM Mammoth on 40 series road rage tires. It pulled quick and hard through 2 gears and then leaned out on top. The tall gear on the Mammoth worked well with the blower because it seemed like torque was increased somewhat at low to upper mid rpms... not so well on dirt because there isn't enough traction.
I tried the same setup with 40 series bowties at revelation raceway and it lit up all 4 tires all the way down the straight. Only problems offroad were traction and throwing the belt off on big jumps. If the belt came off it immediately went rich. One other thing I noticed was the temps never seemed to vary no matter how hard I drove it.
If nothing else it was a kick to hear the blower whine and unbelievable amount of air it was sucking through the filter.
Video on pavement:
