Does anyone have advice (or experience) on Spinning Cycles? I'd really like to get something for my home. I'd really like to get something quiet so I assumed the Keiser M3 Magnetic should be quiet but what does magnetic mean (how does it work). The LeMond was also mentioned as a quiet machine and The Spinner NSX but some say it's very complicated to work on. ??? I don't know what that means. Should I just stick with Schwinn? Why are all Schwinn dealers gone? Anyway, I'd really appreciate some advice if you have any. Thank you!