It would be interesting to see one fly. I was thinking about if I could remember any models flown by one in any of the old magazines. There was one in Flying Models that listed the C-S AP radio called the Sea Horse, but while plans were shown, no pictures of a finished model was shown. I think it was a Don McGovern design, most likely designed and drawn up to provide filler for the magazine that he was the editor for. Pretty sure he did this more than once.
I think there was also a system test flown and discussed in an issue or two of Grid Leaks. Seems to me that they were flying either an H-Ray or a S-Ray as the test ship with a .19 for power. With fail safe, an well trimmed out H-Ray doesn't really need a functioning radio to fly successfully.
I bought a single stick version about five years ago. I don't think it was ever flown. This is from a period of time where radios dropped quickly in price (by half) and digital systems simply blew everything else out of the market.