I've been wanting a trainer since I have kids at home during the day that I can't leave to bike. I can't put them in a bike trailer on the service road of a highway at the speeds I go. When dave leaves for work in the morning, it's dark. When he comes home at 5:30pm, it's dark. I can't get a good workout riding in the neighborhood since it's all twisty and too many turns and traffic.
I wanted one of these for Christmas (they are like, $300-ish) but I happened to open up craigslist where a guy had just posted one for $50 including the tire block!
I watched What Not to Wear and Next Iron Chef while keeping my heart rate at a constant 165 for an hour and 15 minutes.
Nice and shweaty.
Life just got a whole lot less stressful.