Rating: 4 / 5
Purchased in early 2011.
The Ohm is now my default pack for just about everything, from three-season multi-day trips to simple day hikes.
I usually carry it frameless and use 6 sections of Z-rest as pad/frame. This makes the load lifter situation slightly awkward when the pack is not filled about the shoulder strap attachment, but overall, works beautifully, especially considering it was designed for use with the frame.
With the frame in, I find the pack to be perhaps ridiculously tall (can't wear a wide-brimmed hat without knocking it off on the frame all the time), but it does add some structure and load capacity.
The pocket situation is top notch. The back stretch mesh panel is great. The side (bottle) pockets are monstrous and stuff amazingly never falls out of them. And the hipbelt pockets are the bee's knees.
The cord compression system works well for compressing interior loads, but is less suited to attaching gear outside than traditional compression straps. (e.g., snowshoes, crampons, etc.)
The "bareback" back panel of just the straight-up fabric layer does not breathe well, but this is to be expected. Though my back gets pretty wet with sweat here, I find that it's not significantly different than with other packs. (Hey, my back will even sweat without a pack, given the chance.)
Over the course of a few brushy hikes with down-tree dodging this summer, I managed to put a 1.5-inch long diagonal gash in the side panel (black material, silnylon, I think). I have been lazy about dealing with it and it's still there, a dozen trips later, but it hasn't grown.
I wish these side panels were made of the heftier green dyneema material rather than the lighter black material.
I've attached an ice axe, helmet, and crampons a couple times. The ice axe loop feels slightly fragile, but holds up fine. The velcro tabs up top to secure the spike end of the axe are a very nice touch, but some stiching has ripped on one of them. Their placement, as high as they are is also somewhat awkward if the pack is not full above the attachment point. The axe pulls the attachment outward (it is straight after all) and puts extra stress on the attachment.
Overall, it's a great pack that I recommend, despite these few little things that could change to make it perfect... in theory!