Dave
There was a message on the MB site from a chap on the UKRCC who said the system was only licensed at the moment for ISTR 1/10 of a watt, which I believe is markedly lower that the 27/40Mhz trannies. However, The latest MMI says that someone in the Oxford club is using the system without any range probs.
I've also been told, hearsay of course, that if another model using the system gets between you and your model there can be problems. If true it seems to be at odds with the no interference ever again claims.
Cheers
Doug