There's a lot of difference between the different 2.4ghz systems. One thing that doesn't differ is that you don't have to pick out a channel, and they're supposed to sort out any frequency conflicts amongst themselves. SS as it applies to models is a pretty new innovation, and I don't think there are many people that have a handle on the specifics of each available system, let alone a solid understanding of the differences between them. Some use one frequency selection in each flying session, while others hop from frequency to frequency during a session. The theories in play are pretty different from 72mhz, which is a fairly simple thing to understand. As time goes on we'll all get more familiar with SS.

One thing a lot of people are doing is using "spektrum" in place of spectrum. Spektrum is a proper noun. It's become a lot like kleenex, where people refer to tissues as kleenex whether they're Kleenex brand or not. Even though a lot of us refer to 2.4ghz radios as spread spectrum, the word spectrum shows up only on Futaba's home page for their SS products--no place else that I could find. It's interesting to watch the marketeers do their work. Each time a Futaba piece of literature or representative would say "spread spectrum" they'd be saying a word that's phonetically the market leader at the moment. Pretty insidious, eh?