I just posted on videofitness regarding this a few days ago but I have had a sunny 45 lb wheel bike for several years spent around 250 for it. It has never given me any problem but I just recently went to dicks and rode the SOle 700. I fell in Love with the bike. I road for around 20 min when in thestore I didn't get it but still might. I'm going into a larger city tommorrw that sells commercial spin bikes. So I will get to try some top liners. I'm in shop and compare mode now.
But when I bought the sunny I had never done spin and just didn't want a big investment incase the bike ended up collecting dust
But I love spinning do at least once a week and sometimes when all other exercise just seems to much effort I can get on the bike and it warms me up then I end up with a sweat fest
So time to upgrade