PHM,
I have an E-M with a Power Performance (PP) body, assembled by Fred Gimbel of Autovision.
The short version is that Fred is a straight shooter and the car is high quality.
Fred originally assembled mine as an E-M. After some, uh, severe body damage to me and the car, E-M had closed its doors and could not supply another body. It turns out that PP made the molds at one time for E-M, so Fred got one from them and it went right on as expected.
The PP chassis is very similar to the original E-M, in that it is extremely stout and well made. Only difference I'm aware of is the outriggers are now 4" OD tubing instead of small box-shaped metal as mine is. The advantage of the older design to me was the possibility of the undercar exhaust which I have enjoyed immensely.
Fred's been building this car for more than twenty years so he knows what he's doing. It's a solid car all the way around.
After more than 19K miles (and a couple years rehab, but that's another story) I am enjoying the car - headed for the Fling, er, London Cobra show next week - if you're there, look for a Laser Red/white stripe car, two roll bars and a tan interior. Oh yeah, an automatic and a 521
These are good people and the car is good too.
Tom