This is my most recent go-to for UL backpacking. I had a two-man Big Agnes for years, and after adding a second dog to my family it was time to go a little bigger. I'm very impressed by the livability of this tent despite how light weight it is, and I find no fault with the "hoop tent" design. As many out there may know, tunnel tents have long been a go-to choice for four-season conditions, and while I've never had this tent out in the snow (and wouldn't recommend it), I haven't had any issues in the wind. Of course, in windy places it is vital to use as many guylines as possible. The way you pitch a tent always has as much to do with it's performance in the wind as its design or structural integrity. I have seen very strong tents blown down as a result of poor pitch or inadequate guyouts.
All that said, I do have one small complaint. I have grown accustomed to having interior pockets on either side of my doors. The pockets in the HT3 are along the sides of the tent, and thus are more difficult to access from your vestibule. Because I use this tent primarily for backpacking, though, I don't have many accessories to keep in those pockets, and at this point I've gotten used to their locations. For such a minor thing, I didn't feel it warranted the loss of a star. SD has always been know for solid tent designs, and I'm happy to see these guys continuing the tradition.
Very Impressed. Like at least one former reviewer, I've been the owner of a number of Osprey packs over the years. While I've always been a fan of Sierra Designs tents, I think this is the first pack offering I've ever seen from them. When any company tries something new like this, it is seldom done right the first time. I must say, though, this is the exception to the rule. This pack truly does what many others claim to: ventilate while supporting heavy loads comfortably.
I admit the first time I tried this pack on, I wasn't sure about it. Do yourself a favor, though. Reserve judgment until you have the pack weighted. When empty, it had a rigid feeling, and I immediately noticed the ventilation gaps in the lumbar and scapula pads. After weighting the pack and walking for a while, however, the "new" or "different" feeling of the pack was gone, and I could begin to feel those gaps doing their job.
Keep up the good work, SD! I hope to see you get the street cred in the pack market that you deserve, and I look forward to some more great pack designs in 2012.