Nearly everything else in this aisle is self-powered: you turn the pedals, and the machine does nothing until you do. The MERACH MR-E32 is built the other way around. It has a 60 W motor that moves your legs through the stride for you, with 12 automatic programs and a choice of forward or reverse. That one fact changes what the machine is for, and it is the reason to read this page carefully rather than lump it in with the pedal exercisers.
The right way to think about it is this: a self-powered unit asks you to supply the motion, and a motorized one supplies the motion for you. So the MR-E32 is the answer to a specific problem — when starting the motion yourself is the barrier. If you are rebuilding strength, or you sit for long stretches and want your legs moving without having to drive every stroke, a motor is exactly the tool. If you can already pedal unaided, it is solving a problem you do not have.
That distinction cuts both ways, and we will not soften it. A motor moving your legs is passive movement, which is not the same thing as exercise you perform yourself. It is genuinely valuable for some people and genuinely oversold for others, and most of this review is about telling those two cases apart.