I'm transitioning to all-cuben gear, and I was considering the same 3 shelters. But the Skyscape - X was not available when I was ready to buy in March. (The Skyscape - X will be available at the end of May, according to the website.) I went with a Hexamid Solo because it only requires one pole, and I don't use trekking poles. I've only tested my Hexamid in the backyard so far, but I like it. I slept in it in cold, rainy and blustery weather, and I stayed dry.
I find entering the Hexamid to be a bit of a hassle because you have to duck down. But the peak height is good.
I don't have experience in the field with the net flooring, but some have noted that it can pick up snow, mud, water, etc. I think it might be good to get the cuben ground sheet sewn in. I may have that done with mine if I find the net floor to be a problem in the field. Not a problem on my grass yard.
I did have a problem with the pole that I ordered with my Hexamid. It broke when I left my shelter up in a heavy snow. Joe gave me a refund and I replaced the broken pole with a hefty Ruta Locura carbon fiber tarp pole.