Other than burning out a couple of motors (which was my fault) when switching to a Xicoy controller, I have not had any issues either until a couple of weeks ago when I had to belly land because my left main gear would not extend. It worked perfectly after the belly landing when cycling it, I still cannot figure out why it failed to extend. I have since replaced the motor so we'll see if that addresses the issue. In the meantime, I'm considering switching my two minis to Electrons as I have had really good luck with Electrons on other aircraft.