I have "experience" only with the first one I mentioned (Peripheral Electronics). Which is to say, I bought it and tried it, but it didn't work for me because I have the DSP system and stubbornly hoped it would work with it (it didn't, and neither of the other two would either).
But I digress. In short, I've seen the unit, but it wasn't compatible with what I was trying to do. You might want to inquire on the Roadfly A/V forum for some feedback as well.