Look good, sound good, and go boom a lot! We do loads of TVR's @ Falcon. They are usually engine rebuilds and accident damage work, in fact we have one in at the moment for repair. The engines are highly stressed and on average are good for 30k miles.
A good example of how fragile they are was a customers car 6 months ago, it was the cleanest dry stored and well cared for one we had ever seen but it was the big 4.5 model. It let go at 31k miles without warning after she sold it to a young guy who drove it a little harder than she use to
Good cars when they are running right but can cost a fortune to put right