My first XL went up in flames for no appearent reason. No crash, no motor failure, no overheated, no reason. Castle called it a manufacturing defect and promptly replaced it.
I believe I had one of the very first few retail XL's and mine lasted about a week. I have had the replacement up and running for ~2 months now without issue :-)
If I could only draw what I see in my head, then afford to build it, and finaly get to play with it...