I'm wary of any system these days that operates in 2.4Ghz, and I categorically won't specify them for any of my projects because if you thought managing UHF spectrum was hard, try doing that with 2.4!
Admittedly im in the UK where we have a much more sensible UHF spectrum allocation and management program for events, but my point stands.
The 2.4Ghz spectrum shows no signs of becoming less congested, in fact, I would expect it to become increasingly unusable as more and more events and venues increase the presence of wifi and other license-free RF architecture.
It certainly looks interesting from a functionality perspective though. The single most irritating thing about FSII is dealing with volume level on the C&D (3rd & 4th) beltpack channels.
