Have one trip experience with the Atmos 65. I loved mine. My wife hated hers.
While it has minimalist padding in the shoulder straps and hip belt, it carried surprisingly comfortably for me. Loaded it up around 42 lbs, which is definitely at the top end of its comfort range, and it still carried fine. I was a bit concerned that the narrowness of the yoke between the shoulder straps would cause rubbing, but it was not an issue.
The minimalist padding and or adjustability didn't work for my wife. The shoulder straps really bruised her sternum bones and made for a miserable carry. She has carried an Osprey pack for the past 5 or so years and was happy with it. The tradeoff is that the old pack weighs nearly 8 lbs. Would be nice to shave some weight without entirely giving up on comfort.
The pack material is lightweight. So care is required not to overstuff the stretchy pockets or abrade the pack on trees or rocks. The pack also seems to fill up quickly. The internal frame bend eats into useable space and requires careful packing.
All in all, I would say its a great minimalist pack if you aren't generally carrying more than around 30 lbs.