We received this a few days ago. It fits well on our 26" bikes and is strong enough for my big mountain bike and my 6'5" 200lb bike too. Both my son and I have used it with the heart rate sensors turned on. Getting into reasonable heart rate zones for training is not a problem. Ultra high intensity isn't that easy, it won't simulate going up a steep hill or a high end spin bike even if you can get up, which I don't like because I need higher resistance to get up comfortably. If you're in pretty good cardio shape, don't expect to hit super-high intensity with these machines for something like tabata or other interval exercises like this. This is for low impact, low to medium aerobic training and longer calorie burn.
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