I currently fly with the DX7.  Personally I have only had one problem with it, and it was because I was using a 4.8v rx pack.  The pack dropped a cell which meant it was only operating at 3.7v, which put it into a brown out.  Since then I only use 6v battery packs, because if they drop a cell without me knowing it, then I will still have 4.8v working for me.  I have many friends that fly with different radios and when they upgrade it is usually along the lines of what they are already flying with. (Mostly because they are used to it and dont like to change brands).  The LHS on the other hand mainly sells spektrum.