From what I've heard regarding liners, there's no rule as such, you're either lucky or you aren't.

Things to look out for are misfire on startup, White smoke from the tailpipes, pressurising of the cooling system etc. Pretty much the same symptoms as head gasket failure.

Other things that can go wrong is alternator failure, ABS/ESP module failure, cracked seat bases, boost control solenoids, MAP sensors, MAF sensors, some had issues with power steering pipes leaking (Ford recall), oil filter housing diaphragms and probably a couple of other things I can't think of!!

Just do all the checks as you would normally and keep your fingers and toes crossed!