Excellent tent - amazing for backpacking
For long-distance, light weight backpacking (is there any other kind), this is THE tent. It's just a hair over two pounds, packs very compactly, sets up super quick, well-ventilated, and provides more space than you think. And yes, it works for two people. I haven't done the "fast-fly" set up (footprint + fly), but it seems awesome.
I've used this on 1 and 2 person backpacking trips, with other male friends, and also my wife. It's great for my wife and I, certainly cozy (but not cramped) for two guys, and absolutely perfect as a solo tent. The fly creates enough of a vestibule in front of the tent door to keep some gear out of the rain.
One minor adjustment I made was buying cord to better guy-line out the tent. The fly contains guy-lines (and I think the tent body also), but I found with longer/better cord, you could stake out the tent to be more taut, enable better ventilation, and gain a few inches of room around the
edges. Also, I wish Big Agnes would make a formal vestibule for this tent like they have for the Emerald Mountain line. Just a formality, though.
Great tent, but most importantly it's amazingly, ridiculously, and wonderfully light. Your days on the trail will be that much better.