When you learned to use the rollers for the first time, was this true? [/B]
Yes, clipless pedals.
Rollers have a greater learning curve (obviously) so the best way is to set them up in door frame or against a wall so you can bail out if you need to.
Personally, I too have both Rollers and a Trainer. The Rollers I use for spin and cardio work, the trainer I use for strength and power work, but either can be used for all, if you do the research and find materials and books with suggested workouts. Typically, I can tell how much someone spent on rollers by how steady their body (and bike) are when they ride the road.
Additionally, I find two basic things when I ride either.
1. I sweat like horse.
2. I can get a better workout, in less time.
3. Even with a planned workout, music and lots of water, it's boring as hell, and I can only last about 75 minutes.