I now own a Refuge X and I've got a few chances to use it so I have some comments to share.
1) I made a 1.3oz silnylon footprint for this tent which weighs 6oz total. I designed the footprint to be just a little smaller that the outer edges of the tent, so that even if you roll onto the mesh you won't contact the potentially wet ground. I also added a few extra tie outs to the footprint so that it can alternatively be used a tarp. This is real spouse pleaser. If we get to camp and it's pouring rain, I can set up the 104" x 48-60" tarp over our cooking/sitting area and then later I can slip it under the Refuge X when we go to bed.
2) Regarding setting up the tent and getting the ridgeline taut, the length of the trekking pole used is a significant factor in this. Due to the design of the tent, a shorter pole (~105cm) that is level with the top of the tent will give you a taut ridgeline, but the sides will sag a bit in the middle since the line of tension runs through the ridge rather than across the sides to the opposite corner. If you use a longer pole (115cm) you can get perfectly taut sides, but you'll have a lot of slop in the ridgeline. The ideal setup is to set your poles just long enough to get the sides taut. The ridgeline won't be drum tight but it will have the minimum possible slop while having tight sides. Tight sides is more important that a taut ridgeline because non-taut sides sag inward and significantly reduce the interior usable space. If you use the optional tie outs on the sides to increase the interior volume, you want to do this before you do the final tweak to your trekking pole height because this affects the taut-ness of the tent. If you use the optional guy outs and get them pretty tight and high, then you can get away with a shorter trekking pole setting around 108cm that will give you basically a taut ridgeline too. The tent will still sag a bit at the edges though. I'm sure all of this doesn't make a lot of sense to the reader, but go and play with your Refuge X and vary the trekking pole length and you'll see what I mean.