Zurichgnome

Autogeek has some great videos comparing Cyclo to the other two you mention and showing how to use all 3. http://www.autogeek.net/video-swirls.html

By all accounts Cyclo is a great product. I opted not to buy it simply because it looks a little harder to use given that there is space between the heads you need to angle it a bit to get full coverage. Also frankly buying one large pad is cheaper than 2 small ones -- and easier to clean. If I had one, I'd stick with it, I suspect.

Marine Blue

I've never used a cyclo but it definitely looks like it offers similar capabilities as the PC. I think many don't buy them because they tend to cost more and there aren't as many pad options.

Use it if you have it!