With most who go to another brand from spektrum : all their radio issue dissapear & they will never go back.

Scroll wheel issues anyone ?? :-)
DSM & DSM2 are OBSELETE tech. Thats the issue with Spektrum.
http://www.rcmodelreviews.com/dsm2flaw.shtml
They had a better system for years, but didnt care enough to roll it out to car radios (DSMx) .
DSM was relatively instantly dropped for RC AIR by spektrum (DX6 original), yet still deemed good enough for RC Car TX's ...why??
2.4 is now so crowded/noisey , radio gear has to be able to cope.
Spektrums were the ONLY tx's to be effected by Flysky/hobbing transmitters. In fact, locally many tried to have those TX's banned due to issues with Spetrum.Only Spektrum. No other brand was effected.

Having said that, Spektrums new system should be much much better. DSMr
Their transmitters do feel great to use.
And Im sure that many issues blamed on Spektrum radio's are actually caused by something else. That Ive seen myself .