It depends on how you use the trainer.

There have been times when I've crawled away from my trainer vowing never to look at it again out of pain and agony and then I've had easy fat burning spins.

Working out to a set, timed, trainer work out changing your gears and cadence constantly can be way more than you'd get on the road.

It amazes me when I hear of people sitting on a 52x17@85rpm for two hours and call it an intense work out.

It's all what you make it.

Hey pointyhead, got any pictures of your sister?