Got this pack mainly because of the short back length, I'm 5'1" and have struggled to find a multipitch pack that's both bigger than 20L and comfortable to climb in. This is the first multipitch pack I've owned that (1) is big enough to carry a full trad rack, harness and shoes, (2) carries heavy loads comfortably, and (3) has a small enough profile that my helmet won't hit the top of the pack when I look up. Having hip fins for long walk-ins makes it easy to carry heavier loads, and I love that you can stash the hip fins when it's time to climb while retaining the webbing belt to keep the pack stable on your back. To give an example of the type of load it can easily take, when climbing multipitch routes in Morocco, I've managed to fit 3L of water, food, 16 quickdraws, full set of nuts and offsets (partner carried the cams and another set of nuts), harness, shoes, small first aid kit and a warm layer inside the pack, with a 50m half rope and helmet strapped outside the pack, and comfortably carried these on 1-1.5h walk-ins on pretty crappy terrain. In fact, this felt way more comfortable than my usual 40L cragging pack. One more major plus: this pack is small enough to fit under the seat if you're flying with Easyjet, although if you're carrying a helmet it will take up most of that space.
The only niggles for me: (1) the runner's style chest pockets are great for snack bars and hydration for long walk-ins but the pocket for the hydration pouch isn't quite deep enough to hold a 500ml pouch (it will almost definitely fall out unless you're careful to cinch the top over the lid once you've drunk about 50-100ml), and (2) the side compression straps have incredibly small buckles - I found them very fiddly to adjust when I needed to strap a rope to the pack, and they are only just long enough to go over a 50m half rope in a single butterfly coil.
