instructed in them for 15 years...never had an issue...controls a bit light for those moving on to heavier/bigger things.... but as a basic trainer we found them reliable and trustworthy. yes, in a deep stall or spin, the T tail did some interesting things....but we never had any huge problems...except maybe the AUW...if a heavy student turned up and the tanks were already full...
...but had many happy and fun filled hours in them.