Me and 3 other bought a DX7 at approximately the same time.  I was new to it all (the 2.4 gig). Had my LHS help me with the set up.  Crashed.  The plane lost bind right after take off.  Set everything up in different plane different servos, reciever, and batteries.  Let one of my buddies check the bind and set up (he works at the LHS been flying forever he flies futaba FASST) took off, started into pattern, plane uncontrollably rolled over and nosedived.  Again lost bind.  This all happened to a total of 4 planes.  Sent all epuipment to horizon with pictures of everytihng set up in the plane before it crashed, they said set up was perfect and nothing was wrong. These were multiple different set ups that were range tested as per the manual.  I've been flying for awhile so lets just say it wasn't my flying skills.  Out of the 3 of  us who bought one, 2 of them got returned........for pretty much the same reason I returned mine....bad binding.  Been flying FASST for 8 months, zero, ziltch, nothing, nada, when it comes to problems not even a glitch.  Rock solid. Maybe the two systems were bad systems, I don't know.  But after the loss of $2000 in planes and equipment, I will never fly with anything that has to do with spektrum/ DSM, DSM2 technology.