I somehow never got on the Osprey train early on as a thru-hiker and now they've come out with their lightest pack ever. I had never used a pack with a full frame or suspension system prior to this hike, so it was quite an adjustment for my body. The greatest difference is that it carries heavier loads comfortably, but feels a bit awkward when the load gets under 10-15lbs (I'm usually 15-20 fully loaded). Osprey packed a lot of classic features into a pound and a half, but I felt like it was too many unnecessary bells and whistles. I'd love to see the next version of this pack without the brain, and in a smaller capacity size (45L was perfect for my longest food carry, but otherwise too big for summer ultralight backpacking). It's definitely a great pack for anyone getting into ultralight gear setups that still appreciates (or is used to) a backpack with suspension.