RE: Which 2.4 GHz system for me?
Let's see if I get this right....
Spektrum's 2.4Ghz tech is DSSS. It locks onto one channel, and stays there, until you turn it off and back on again. I've read (somewhere) that there is a theoretical limit to how many people can have their Spektrums on at any one time. I wanna say it's 79, but am not 100% sure.
The Nomadio, and I believe the Futaba FASST system use FHDSS. It's constantly (100 times/second?) switching channels on the band, so potentially billions (or something equally outrageous) of people could have their systems on at the same time and not interfere with each other.
I'm not sure on any of this, so hopefully someone else will chime in if I got it wrong.