Sorry, this has probably been covered before several times but the search is not working for me...

I just finished a fun session of rollers down in the basement, and I was wondering if those who have tried the newfangled e-motion floating rollers can explain how/why they are different (or better) than my cheapo performance rollers which seem to work just fine for me....as far as I can tell one benefit may be that it is easier to ride the e-motion rollers while standing up...true? Any other real benefit?

Doug