They do what they claim to do, the rollers are getting eaten up by my Rogue Aggro bar's knurling, but I think most things that get that bar slammed into them will get eaten up eventually. Allows you to smoothly move the bar left and right, even under load. My one complaint about these is the tolerances. I'm putting a Titan roller on a Titan (T-3) rack, and one roller is so tight I struggle to get it on and off, and the other was so tight it just wouldn't go on the rack. I solved both issues with a snading belt and took off a layer of plastic, but still would expect the J-cups to fit on the rack given the price of them.

I love these handles. I don't use them too often, but when I do they're the only thing that can fill that niche. For me, especially for chest flyes, allowing my wrists to rotate my palms slightly (10 degrees or so) downward at the outer stretch of the movement actually saves me a lot of shoulder pain, and makes it possible to do volume. Given the price, I had to knock points off around build quality. The rubber handles feel cheap and are sticky. I ended up buying the 3d printed Darko handle replacement, I had doubts about 3d printed knurling, but they're a massive upgrade and make these handles feel amazing on the hand.