I will not be using the disks. I think it’s great for those without joint problems to actually strengthen the joints, but once you have moderate/severe arthritis in joints like knees, ankles, etc, the more stress you place on them the worse it is. I found out too late that jumping around when you have arthritis makes it worse. I’d been following the ubiquitous advice (for years) that jumping strengthens the bones and joints, yes it does, but only if you don’t have joint problems already. Not that using disks is jumping, but it still places stress and instability on the joints, so if you have arthritis in your lower joints, be careful.