I'm not very confident in the crash worthiness of the Robbie anyway. If you've ever seen post-crash pictures, the site isn't pretty. There are exceptions where the crash is hard auto to paved runway... the skids split and absorb a LOT of impact quite nicely. Dyanmic roll overs and autos into trees with any forward airspeed are pretty brutal in the Robbie.
The B47 uses lap belt with NO shoulder restraint! The B2B and 280FX uses 4-point harness systems. I feel a little safer in the 4-point harnesses vs. lap & shoulder belt alone. Looking back at my statement above, I have to ask why I'm flying the R22 without a helmet?
That's another topic for discussion, but most of my flying is "casual" (if there is such a thing). I guess the comfort and sound quality of my Bose Aviation-X is something that makes it much more enjoyable... and it's not like I'm doing line patrol or other hazardous work in the Robbie.