I bought a set of rollers a couple of years ago with the same intention of training during the winter months. I used mine a few times, then decided I could no longer take the boredom of riding inside.

That was the first year I rode outside all winter. Turned out to be loads of fun and a heck of a workout. The most intense workout I've ever had was a 7 mile ride that took nearly 2 hours because I was trudging through 5" of unplowed snow. I was in my lowest gear, standing on the pedals and barely breaking 4 mph. I had to keep stopping to let my heart rate come down from the stratosphere. After riding outside that whole winter, come spring I was the strongest I've ever been on the bike.

Just saw my rollers this morning sitting in the corner with 2 years worth of dust on them. I should probably throw them on Craigslist as hopefully I'll never use them again.