Expensive, large footprint, and not very versatile. You could really replicate this with a landmine, good attachments, and a couple extra minutes of setup and save yourself a bunch of money
Super helpful on a functional trainer in case you put something on backwards and don't want to take it off again to fix it. It also just makes movements much smoother
Black widow makes great stuff. This would be a great option for bench as well, getting the training stimulus of a fat grip bar plus extra range of motion, plus the camber being close enough that you could close grip bench with it as well
These were on most of the platforms I used at ATP gym. Much better quality and much more grippy than horse stall mats, and they all fit together very nicely leaving no cracks in between