I have the CompuSTAR as well - fantastic system. The only issues I've had are with the remote - over time they get really worn out and the remote mine uses is no longer available from the company. However I could to to an FM model (mine uses SpreadSpectrum for the 6000 ft radius) by replacing the remote and antenna, but it pushes the radius down to 3000 ft. So far I've managed to snag remotes for SS on eBay but it's becoming harder and harder to find them.

-- John