My two pence worth.
I bought the Truggy brand new. I love it. I've bought a fair few bits as replacements (motors, esc) after reading various posts etc and thus far haven't had to replace anything. It is still stock.
I run it stock on 2s and 3s and never had any problems with the motor, or any over heating. I do not run on grass though, as that does cause issues with stock set up on Lipo.
The only thing i do use are different wheels and tyres, just because I think it looks better with them than the stock ones. Oh and bumpers from Tbone.