I haven't bought my Spyder yet, but am doing my research. I currently ride a Suzuki Boulevard c90t, so I am quite used to the cruiser style set up. That is why I am looking at the F3. I have always ridden cruisers except for my first bike way back in the 80's (Honda V65 Magna-a standard). I have been of the opinion that the RS set up would not suit me, because of WHY I am looking at the Spyder. See, my knees are getting worse, seemingly by the month. I am predicting that in a year, 2 at the outside, I will HAVE to give up 2 wheels and go to 3. All that being said, I am a long distance rider, state coordinator for Run For The Wall, every May I do several days of 300+ miles. I always thought it was my seat, but after reading these posts I may have to say it is the cruiser "stance" that has been causing my tail-bone issues. I may have to forego the F3, and start focusing on the ST. I would say RS but, I really don't think the sitting on my heels thing will work for me, especially with knee issues. I am not a fan of the RT either, just TOO big. I will try them all eventually though and posts like this are making me THINK, which is always a good thing before spending that much $$$. BTW, I ride most of the time, regardless of weather. My bike currently gets in excess of 20k miles per year, vs. my car getting less than 10K.