I had a 2015 model last year, and sold it. I really wanted to like the pack, but ... my thoughts from ~ six-eight months with one:
Solid pack, and a good design for my needs. I will say that the 3500 could be collapsed down to nothing, and not be flopping around while empty.
However, the company has changed the frame design three times in three years that I am tracking, and that was a challenge to figure out what I needed if I wanted to add to the base frame and pack.
A buddy bought a 2016 model, and his frame broke. They were good about fixing it, but could have been a real problem in the hunting season.
We both carried 30-45 pounds in the pack pre-season, and about 20 during the hunt.
My recovery after the hunt was the longest I've ever had from a pack, and I trained with it for several months prior to the hunt.
In the end, the post-hunt back pain, the lack of timely response to questions, and the investment drove me to look elsewhere for a pack.
