I love mine ! It's was only completed at the end of last year then tucked away for the winter so I've not had too many miles on it yet. As has been said already. The car maintains its usability but becomes much better when you plant your right foot. I'm running 430 and the hubs which should be safe for me. I did have a hand in building the car so I think I appreciate that side of things more and I would recommend doing it yourself if your handy with a spanner. There's a lot of folk on here that have done it so I'm sure if you put up a build thread everyone would chip in if you got stuck.
I plan on keeping my car so I'm not fussed about its resale value ( just as well lol)
If you plan on selling it on at some point you will lose big time so as the other say maybe buying a fully built one is the better option
Cheers
Paul