Hi Steve,
Good luck with your search and there are loads of threads and opinions on here and plenty of help and advice.
There have been issues with the early cars but these are well known and as long as the car has the upgrades I wouldn't rule one out.
The key ones, applicable to 2012 and 2013 models are:
Ensure it has the bolt in chassis bracing mod (or a replacement chassis)
Centa drive upgrade
Steel rear drive sprocket
"Comfort steering" mod - not essential but makes for a less lively drive
Urban cooling kit - reduces exhaust and engine temp
Ideally go for one that has been used as this will have flushed out problems.
Thanks I hope to look at a 2012 next week. Needed this information.
