If you are not careful you can punch a hole in a tarp. I have seen it done. I now have a good buddy with a patched tarp who will testify that the JRB bars are sharp enough if you don't get in slow, or set up with enough slack / distance in the tarp.
I have had good luck with my sil nylon and my JRB bars, but I'd be particularily worried about cuban...
The Cuben should wear well as long as you go for a decent weight and not the super, super light stuff.... CT5 is nice