My husbands disabilities prevent him from doing conventional exercises, or using standard exercise equipment. This seamed a good idea to be able to exercise sitting in a chair. I looked at the cheaper versions, and was put off by buyers comments of it them being too light and feet slipping, also by what appeared to be poor tension adjustment. The extra for this machine did seem a bit much, but it did say it was used by professionals.
We have had many pedal cycles over the past few years and although much more expensive than we normally spend this one is in a league of its own. 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, it is very stable on the floor, easy to pedal and has minimal noise. 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 get fit before tackling the maximum tension. If you want to use the machine sitting in a computer chair which normally 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 etc, but I don't think that really matters anyway, you know your own limits. This is a perfect machine for those with limited mobility. Very pleased