Do you, or have you, used a hands free crutch?

Hi there! If you're reading this, thanks! I want to know everything about the experience using a hands off crutch like the iWalk3.0.

What went well, what didn't. Are there long term issues or benefits? What could be better on it?

I had a brother who used one and while it was great short term for his mobility, he had some long term issues in his hip and back. So now I'm curious what other people's experiences have been here in Wichita.