I came close to buying one a couple of weeks back, but bottled out due to cost. Nick was very responsive to my email questions, but I don't want a decat so it means nearly £800 for a full system. If they did a system using the original cat I probably would have gone for it.
I am still in the market for a new exhaust really, certainly need new rear mounts again!
I know, if you buy a sport cat it is very expensive but to be honest I don't see the problem with a decat system. The only trouble is getting it through the MOT but there are plenty of "sympathetic" businesses out there, I know a few people in the TVR club so I managed to find one quite easily.
It really is a great system and the performance gain is noticeable, not to mention what a fantastic raspy noise it makes!
The closest thing to it sound wise was the Piper exhaust I had fitted to my 182 Cup, which was great, a lot better than the Milltek which was on my Trophy until last weekend (which for the record was the worst system I have ever come across in terms of build quality and it sounded quite poor too) but I really am glad I spotted the Pure Motorsport system the other week, I am loving every drive!
I would say go for it, if you can live with a decat! Failing that I can thoroughly recommend the Piper system.