I don't know how this machine compares to others. I have no idea. Here's what I know: I've had treadmills and elliptical machines, weight benches and several exercise appliances from infomercials. They all work exactly like they should if you use the equipment on a consistent basis. That's where the problem comes in. I would always give up eventually and the machine would sit in the corner, covered with my laundry, laughing at me. I bought this rower without ever even trying one at the gym because I was desperate to do something (and I voted for Frank Underwood). This was the one machine I was not only able to stick with, but I now eagerly look forward to using. It started a chain reaction that changed everything. You know those incredible before/after transformation pictures you see on weight loss shows? I'm one of those guys now. Rowing is like a 'secret' in the fitness world in the way there is so little emphasis. However, in terms of results, it is so much more efficient. It works your upper and lower body at the same time, huge cardio/fat burner and builds muscle like crazy. I'm glad I'm in on the secret too.
The rowing machine itself is unlike any other on the market with its patented water filled flywheel. It is hard to exactly copy the action of a scull on the water, but the mechanics of the flywheel spinning in water comes in a close second on dry land. The fact that the water is 800 times denser than air means that there is no need for any extra resistance or dampening that you will find in normal air rowers. The faster you pull, the more resistance is generated giving it infinite variability. However, if you want to be able to practice rowing with a faster stroke, you will have to reduce the amount of water in the tank unlike an air rower where you just have to adjust the baffle. 
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