No there very little to say bad about preview for developers! Its app based and only a matter of signing out from the app when the official update rolls out.. I used to be in the same bus as you and got fed up reading about getting early use of new software updates and made the jump and now enjoying features which will roll out months later. You've a flagship phone and it will have no bother with lag, were older devices are showing there age with the new heavier features software. Bugs are very few and most are apps based on how they run. You really should read the Editor's reviews from here and maybe help with your choice!