haha...Here is a photo of my original Dynabar prototype...still working great. I have had and used the V3 and V5, but someone buys those sooner or later and I always come back around to "old faithful". At the time the prototype was developed they did not have one with a rope, so I experimented a little and then they developed models with rope option. I had a length of Dyneema that happened to be long enough to go "double" across the span, which is way over-kill, but certainly bomb-proof, and spreads the chafing out a little bit (which is not significant at all). I thin that Dyneema pictured has lasted over 3 years of hard use (150+ sessions/year water and snow)
I think this was the V1 from 2010
One nice think about the later versions was the rod slide is completely removable (whereas on my prototype, V1 and V2 they were welded). If you are riding a directional board (which is more fragile) it is sort of nice just having the rope in case you need to paddle your board in - because the hook and bar will not grind into your board like a fixed hook. The other nice thing is they pack easily without a fixed hook.
I'm drooling over the new forged bar...that looks nice and super strong!
But anyway the Dynabar really lets you crank your hips however you want and reduces the effort on your back for sure. So since I ride toeside almost half the time this is also really nice!