Ok, it's raining outside, so I don't get to ride today. How sad.

But wait? What's this? Someone on craigslist is selling a fluid2 trainer for a decent price! And I think, on a rainy day like today, what would be better?

So, before I pull the trigger, how complicated is this thing to attach?
EDIT: And another question: is it significantly better than heading to my gym's spin class?