That's pretty cool and would work for some.

For me: It doesn't rain enough to justify the cost. I'm slightly claustrophobic - no wait I am majorly claustrophobic, and I just can't see putting that over my head. And I am not stable on my feet all the time and as I looked at this I couldn't figure out how it would work if I fell. I looks like you put your head through a hole but with falling would that cut in to your neck? Give you whiplash as your head would have nothing to "hit" and/or would one of the spokes end up breaking and you end with a cut? OK I see too many safety hazards with this for one who is not stable on their feet all the time.

Let us know how it works for you.