They all have there problems, the ultra light build that is required has made these aircraft a bit fragile and even new aircraft are starting to exhibit problems.
In the hands of a careful owner the problems can be contained, group owned aircraft are another thing !
Take someone who has maintained these aircraft along with you to inspect any aircraft you are considering buying...........it won't be long before you find out why the Cessna 152 is still the preferred option for a club trainer.