Bill,
I'm sure the cyclo has it's place. It's just one of those things that you don't need, but if you have it, I'm sure you could find a use for it.
However, if you have a Rotary and PC. You can do far more than you could would just a Cyclo for the about the same amount of $$$, if not less. You'll will end up having a much more powerful set of tools in your arsenal as well, capable of addressing any issue.
The PC is more nimble due to it's single head design. Shared std. 6.5" pads with a rotary. Is much much less expensive.
A Cyclo really only shines for those moderate swirls, for which, a Rotary can take care of in much less time and product. For a pro, that means more money in his back pocket.
As for the 4" pads, I wouldn't want to do an entire vehicle with those on a PC or Rotary! 6" are bordering on small if you decide to wet sand and entire vehicle to get rid of orange peel. That's when a rotary and 8" come in handy.
Is a cyclo a nice product? I have no doubts it is.
Is it being hyped here a bit on Autopian ... yes it is.
Is it a necessary tool in your toolbox. No.
For me, the benefit/cost ratio makes it an undesirable product.
Option 1
PC 7424DA : 70 / $130 = 53%
Used Rotary 9227C: 90 / $120 = 75%
Total Cost: $250 with plus 70 rating
For $250 USD, you can purchase a top of the line DA and Rotary and clean your carpets, wax to heavy compounding.
Option 2:
Cyclo: 50 / $260 = 20%
You can carpet clean, wax and moderately compound. For any heavy swirls or wet sanding mark removal, you'll need to have a rotary on hand. Plus, you'll have a hard time around mirrors etc so you'll need to follow-up with some manual, tiresome compounding.
It just doesn't make financial sense in my opinion to get a cyclo. If the price of the unit was 1/2 or less than what it is sealing for, then perhaps, I could see a place for it.
Then again, if I was given one for Xmas. I wouldn't exactly be disappointed
Paco