This is a great pack. I was looking for a couple things in a pack that I was unable to find elsewhere.
Size: At ~50 liters this is just right for traveling light for up to a week or so, but small enough that its not overkill for the standard "overnite bagging a long approach peak". The narrow width of this pack, combined with a rather large top, allows it to grow and shrink better than other packs I've used.
Large side pockets - I like to use water bottles, and grab them from my side pockets without taking the pack off. So many packs these days (Osprey - I'm looking at you) have side pockets that are barely big enough for a small bottle, and even thats a tight fit if you have a sleeping bag or something pushing out the bottom of the pack. This pack's side pockets are plenty big for a plastic water bottle + map, my standard setup.
Good suspension - you are going to pay a weight penalty for this but in my opinion its worth it. My previous pack (an REI flash-50) was lighter but had flimsy suspension. Net-net, this pack feels better at the end of the day despite being a bit heavier.
Under-the-bottom straps to hold a small tent. Many packs in this size range seem to be forgoing this anymore, but I think they work great. In an early morning when your tent is wet I don't like to shove it in the pack with the rest of my stuff, outside the pack is ideal.
The shovel pouch is a nice place to put other wet stuff. It's not huge but plenty big for stakes and an extra layer if you wanted.
The fabric is a little beefier than I think I need, but its nice that its waterproof. I suspect that the higher weight of the fabric is pretty much offset by not carrying a pack cover.
The brain top comes off easily, and the pack actually functions well without it.
All in all this is a really great pack if you are looking for a similar set of features.