Hey there! I credit Indoor Cycling with really improving my overall cycling ability and keeping me fairly bike fit year round. I've been a road cyclist for years (and years and years) and started 'spinning' regularly about seven years ago. My bike fitness and ability SOARED. Now I teach INDOOR CYCLING at my local Y. Be careful what you refer to as Spinning or the JohnnyG/MadDogg police will come after you.
Only gyms that pay a fee to MadDogg are allowed to call their programs SPINNING. Some Y's pay the fee and are licensed to call their programs SPIN, but many are not, so it's called Indoor Cycling.

I don't know if I'd spend the money on a bike for home use. If I'm gonna train at home, it's going to be on my bike with my trainer and the bke, that fits me perfectly. No spin bike is gonna fit as well as your own, the adjustments just aren't that fine.

Any time on a bike is a good time though!