They are slow, and although the look of them has grown on me over the years, they're not that pretty. BUT, they make for an excellent little autoX car, and IMO are very fun cars to drive around. I'm not sure I would care to make it fast in a straight line, kinda ruins the point of what the car was ment to be....but that's just my opinion I guess.
And although I'm obviously a fan of SVT products, I wouldn't make this trade unless you plan on doing alot of autox. And aside from that, it sounds like you might just being buying someone else's problems with this car.