I think that we must have obtained the first batch or crate of these models. The quality of my Spit was definately below what I've come to expect from World! They sent me a new wing and I nticed that the fit & finish on the replacement was far superior to my original. The servo mount for the retract was secured much better! (I still reinfoced it with light ply however).
Quite strange that the tail "fell" off after just 30 flights. Did you report this to World?
-Paul