Amuro:

Besides the reason Planedev mentioned, if you go to a group meeting of any of the clubs, this is the first thing they'll drill into your head. Not to mention the Danville Battlepark is now legal freq's only, as per FCC regulations. If you're not using a legal radio, you're SOL. Bottom line is, if you want to avoid any problems, stay on the legal ground freq's.

The new Spekrum systems are apparently on new freqs, and so far, legal for everything, and as yet interference-free. They are not succeptable to 'shoot-down' (jamming by two or more users on the same freq) or harmonic interference between bands, and have been tested successfully with the Tamiya Battle system.

As for licenses: no-one I know using surface radios buys licenses anymore in Canada. From what I understand in my web-search, RC models are now self-regulated, and under license-exemption. When I tried to go into flying a few years back, the only 'certification' I need for radio gear was a FM double-conversion certified radio, along with MAAC and local club memberships that covered me for liability. I suspect we got exempted because some of the fliers petitioned... if no enforcement is being done, whats the point?