I have an Odyssey and I like it
I've used this pack on an 8 day backpack in the Sierra, in September, during which it rained on and off during 4 days and nights (very unusual). As always, I used a trash compactor bag inside for waterproofing, and lined my down sleeping bag's stuff sack with an oven roaster bag. I'm not a fan of pack covers, and did not hike with one. I did however, use a separate garbage bag at night as a pack cover. This combination kept my gear dry all week (ignoring the condensation from the fly), including drizzle, downpours and hail. The pack dried pretty quickly in the (usually) dry air of the Sierra.
I'd give the pack 4 out of 5 stars for comfort (shoulder straps and waist belt), convenience, accesibility, packability and volume. I was able to fit a large bear cannister above the sleeping bag and other stuff in the main compartment.
The hip pockets are too small for a day's supply of snacks, but would get in the way of an accessory pouch, and the top lid is rather small, so it lost a star for that.
I do not use the mesh side pockets for a rigid water bottle; that would be too long a reach for my old shoulders. Instead I've used them to stowe 2 partially filled 2 liter platypus bladders, ground sheets, poles, and other simillar items. They were very convenient for this.
The accessory attachment options worked fine for drying out crocs and such. I was able to get ALL my gear inside the pack, and only kept items on the outside for drying or convenience.
The durability was more than sufficcient for me, but I'm pretty careful with my gear and did not bushwhack with it. I kept it inside a duffle during the flights.
I had previously used a Go-lite Trek, which was kind of tight for an 8 day trip with bear cannister. The Trek became quite uncomfortable above 30 pounds: when Go-lite specifies a weight rating, I'd avoid exceeding it. The Odyssey is rated to 50 lbs. I'm not sure about cramming in 50 pounds, but I probably came pretty close to 35 and had no problems.
Ed