I purchased back in 2015, with upgrades from average joe innovation on the dials and handles these were great. I never dropped them so I didn’t have to worry about breaking them. Adjusting weights was easy and quick. The only downfall was if re-racking at wrong angle a weight plate would come out, causing you to pretty much reset the dumbbell to fix it. I sold them only because something newer and shinier came out.

If you want to see what roller j cups are about these are a good option to start with.

Heavier sets get pretty bulky. Very durable. Wasn’t a fan of the contoured handle. Knurling was passive.