I haven't purchased one but saw them used at the VA hospital when I was doing my nurses training. I thought they were wonderful!!!
The first thing that came to mind when I first saw one was "What numb skull thought this up? This will never work because it will leak."
Well, I never saw one leak and they were great for working with our veterans that had mobility issues, lost limbs, etc. So much easier access for wheelchair bound people or if you have trouble standing. So many of them appreciated the pain relief they got from using them.
Ann in TN