"On the other side of the coin," rollers are better for your bike than a stationary unit. Why you ask ... Rollers simulate the road and the handlebars/headset bearings will move slightly upon each pedal stroke. On a stationary unit, the headset does not move and upon a single season on a stationary trainer, the bearings can indent the inner races of the headset so it will not turn freely when you return to the road. In fact, many of the mechanics in the other forums recommend replacing the headsets every season if you use a stationary trainer.

Just some food for thought.