I've field tested the silnylon Refuge now on more than one occasion. this is a real 2 person tent with space for two to fully stretch out and space for 4 to sit up and play cards. It's easy to set up, has solid ventilation, and good overlap for splash protection in the rain.
It doesn't have a bathtub floor but the sides of the integrated floor do come up a bit so flowing water shouldn't be an issue (if that ever comes up).
I don't have a The One but that looks like another great design. It might be faster to pitch and it's cheaper than the cuben Refuge X. However, if extra space and the possiblity of two people is your goal, you just can't beat it! My future review will include both the silnylon and cuben versions but I don't have the X yet…
This vestibule will easily handle to pairs of shoes and 2 ultralight packs. and there's good room inside too for extra gear.
My experience with Cuben tarps tells me that the Refuge X will have low stretch (like Spinnaker and better than silnylon) and excelent tear strength. It also tells me that it will be less puncture resistant (not an issue really- the floor is silnylon) and that you'l want to seal the seams to make them strong. You will need to be careful with both tents to some degree but I imagine the Refuge X will be fine- my cuben tarp still is, as is my cuben pack and cuben stuff sacks. Punctures are the main issue.
Fun stuff!
Doug