Here is a poll from another forum. It's not scientific but still alarming in that 31% have had a flyaway with half of those recovered.
http://www.rcgroups.com/forums/showthre ... ht=flyaway
No doubt many of the flyaways could be blamed on pilot error and many who have have had no problems have not found this thread and posted. Also consider that many who post that they have not had problems may
yet have a flyaway. There are many experienced RC enthusiasts who have had very many successful flights but then suffered a flyaway for no apparent reason.
Anytime you post about a flyaway, the DJI fanboys (or maybe shills) will do everything to blame it on pilot error but these are very complex machines with lots of ways to fail.
This is an expensive and somewaht risky hobby. If you absolutely could not afford the loss, maybe you should consider doing something different.