great answer adventure girl!

Group spin classes are a great way to stay motivated. the bikes arent always terribly comfortable.

i would recommend you try each. can you picture yourself spending HOURS in the winter on one of the choices? i know someone who was all set up at home to with her bike and wind trainer, and poof she ended up going to spin classes because she hated spinning alone.

me - i have specific workouts i want to do, so i try a combination. Spinning alone can be pretty boring and can burn you out pretty quick.

anyway just a couple of thoughts...