This is my second review on this pack. I tested it out for the first time last year on a quick mountaineering day trip here locally near SLC. The 22L size was plenty for all my layers, food, water, crampons, and other essentials for a full day on the mountain. Plus, I the attachment features made it easy to add trekking poles, an ice ax, and helmet to the outside.
I've since used it on plenty of hiking and climbing day-trips. It's great to throw in quickdraws or trad gear in on the way to the crag, coupled with the helmet attachment. Easy to throw a rope over top as well.
Most recently, I used it to scramble up 200 feet of low grade 5 climbing, traverse accross a ridge, and then run 3.5 miles back down. It was comfortable for the approach and didn't restrict movement while scrambling/climbing (without harness),. I was extremely surprised to find that the pack stayed stable and moved well with me on the run back down. Granted I only had a few pounds of food, water, and backup layers in the pack, while running, but it worked so well I forgot I was wearing it.
I've used it for about a year now and honestly can't come up with any real cons. The back panel heats up a bit more than some of the suspended mesh packs on the market, but the ridged foam of the Airscape back panel works pretty well to keep you cool, while also allowing the pack to sit close to your body and maintain a low profile. the hip belt straps are way too long for me, but you can always just cut them down to your size. I recommend this to everyone without hesitation.