I finally had time to try this on a tree. I put one Treehopper step on the strap. I did not have more steps to add unless I undid other ROS which would have been a bit tedious.
So take this for what its worth...
The Roller cam and strap easily got nice and tight on the tree. I stepped on the step and it seemed to remain fairly tight, but it was an extremely short test. I can't say how the strap material that the cam comes with will continue to perform with prolonged use in various conditions.
A couple thoughts about this...
I do believe the Roller cam itself is a better cam than the standard style we've used for eons.
This place does sell just the cam without the strap so you could use your own straps with this.
Also, the cam strap I bought was just a cam buckle and plain strap (no loops) so I could not try it out on gear with versa buttons (or my Predator) so I can't comment on that either. I have had issues with the stock Predator buckles being almost impossible to release. I think I will get some Roller Cams with the looped ends, which are available in several lengths. If the strap material has a low stretch factor, it will probably be an improvement over the standard straps that Tethrd puts on their platforms. I'm optimistic these will work great with the way we tighten a Predator strap as we cam it over. I think we will be able the get the strap very tight with less effort.
I'm cautiously optimistic about this new product for a variety of stuff we use cams straps for.
I'd like to hear some opinions from other guys when they test out their's.