Computrainer increases the resistance in proportion to the gradient, so you are forced to change your gears just as you would on a real hill. The interaction with you PC is really the point of it - the actual wheel on flywheel resistance is much like the Kurt, but the training impact of the CT is far preferable.
Yes, it's very expensive - over $1,000.
Both Continental and Tacx make trainer specific tires that are quiter, wear slower, and have a little better grip on the flywheel. I could not recommend them more highly. They are not for the road, so they are suited for trainer only bikes or trainer-only wheels. I don't view trainers as being very hard on frames compared to the stresses of most roads, but I endorse the idea of a trainer only bike which can be WAY cheaper than a normal bike as it just has to fit and have decent shifting and cranks - it can be heavy, any material, you can use cheaper components, etc. If it's on the trainer you won't have an excuse not to ride it. If you have any worries about trainers hurting frames, that takes care of it. Old steel bikes for $100 on e-Bay can be great trainer bikes.
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"You never make a gift of Ventoux"
Eddie Merckx to Lance Armstrong
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