172 Cup, What do I need to know?

[Yadizzle1]

I fancy selling my Panda 100HP and moving up a class to a 172 Cup. Now I've heard a tonne of horror stories from mates who have worked on one, but went out for a thrash in a mates one last night and it's left me very impressed.

Are they really that bad for electrical gremlins?
What should I be looking out for if I want to buy one?