Have an Aura 50 (the atmos for women) and enjoy the ability to jam a bladder in the frame instead of the inside with the bear can mashing it.

However, the "ultralight" nature of the pack means barely any padding on the hips and I end up wearing a fleece shirt around my waist to protect my aging hipbones. Also if not packed very carefully it feels like the pack wants to pull me backward on hills, thanks to the curvature of the frame and the need for a bear can, which only sits in one spot in the pack, near the top with the edge of the lid jammed under the top bar of the frame.

Otherwise this would be a great pack. I sweat like a horse so the mesh ends up soaked, the ventilation doesn't seem to make much difference to me.