My disabilities prevent me from doing conventionsal exercises, or useing standard exercise equipment. This seamed a good idea to be able to exercise sitting in a chair. I looked at the £30 version, and was put off by buyers comments of it being to light and feet slipping, also by what appeared to be poor tention adjustment. An extra £100 pounds for this machine did seem a bit much, but it did say it was used by professionals.
It would appear that the old saying of you get what you pay for holds true. This is a sturdy, well built machine. It is quite heavy and the span of the legs combined with good gripping feet mean it doesn't move when peddling. The front feet can be slid forward to extend the base length half as much again, so it is very stable. The tension adjustment knob has to be turned five complete revolutions between low and high tension, so you get very fine control. The peddle action is very smooth and quiet, though I think you may have to be a professional cyclist to cope with maximum tension. If you want to use the machine sitting in a computer chair which mormaly has casters, straps are provided to go round the base of the chair and attach to front legs of machine to stop the chair moving. I'm not sure how accurate the readout is, of distance and speed ect, but I don't think that really matters anyway, you know your own limits. This is a perfect machine for those with limited mobility.