This is awesome! I'm pretty sure I've seen this out and about already.
Pros:
- Walking with a crutch is awkward and you can't carry anything, this totally frees you up.
- $150 is so cheap for access to this kind of mobility.
- That height range is amazing!
- Reminds me of pegleg pirates, which is great.
Cons:
- Might not be great for your knee to be bent like that for long periods of time, but I'm sure there are all sorts of warnings about being it in for too long.
- A rental service might be more useful than buying them outright.