I purchased the Hyperlight because of the weight. I found it to be extremely light, compared to other backpacking tents I've used. Since I think it is a good idea that could be refined, I'll begin with the negative comments, which are few.
I have returned the tent for the simple reason that, after a few days set up in one room of my house, I could not figure out how to get two long Thermarest pads in it at the same time without some indication that one of us would either have his head or his feet well into the side wall of the tent. In fact, I found that at least one corner of one pad was always jammed into the side of the tent.
I was impressed with the size and floor space initially, but it is such a strange configuration that, once the pads (indicating sleeping people) were in place, it was obvious that most of this generous space was not very useful. I could imagine packs being emptied outside the tent, and the gear being stowed in several piles in each corner of the tent.
Once the tent is up, it is indeed very strong. Cinching down the tarp straps that connect it to the body make it pretty bomber. I could imagine staying dry in a heavy storm. Setting up the tent with its rather unique pole system took me a little getting used to. I would NOT recommend this tent be set up for the first time at the first use in the dark late at night - it could be quite frustrating.
The door works easy, as advertised. The slope angle of the tent door is such that the vestibule area didn't seem that useful for the amount of space given. With only two pairs of boots outside the tent, I could imagine one pair jammed up against the underside of the vestibule.
The complete tent is light enough for one person, thus a generous solo tent, and a second person in a pinch. Of course, two short people with short pads would probably find it quite useful.
I also had some concern about the shape and size of the tent footprint (large), and how it would fit in certain situations (heavily wooded areas).
I did have great service from Backcountry.com, and they answered all my questions.