If you can, please give me your opinion on the following products. I haven't had the opportunity to try either one of them out, so I don't know how good they sound, or how the cheaper pedal compares to the more expensive one.

Thanks

Dunlop Rotovibe: http://www.samedaymusic.com/product--DAVJH4S

Hughes & Kettner Rotosphere http://www.zzounds.com/item--HUGROTOII

Dick...
I use the Digitech RP200...
Yeah, I know it's a guitar pedal, but I use it regularly when playing my T3. Works like a hot damn....and I've got the option of using it for what it was intended (guitar).

Works for me...

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...shboom

Just in case you maybe interested , check out the PAIA Synthespin . They can usually be found on Ebay .