My understanding is they have moved on from the original Ultra fabric a long time ago. It's Ultragrid, Ultra 200X, or Ultra 400X now. When I was doing the research, 400X seemed like an upgrade across the board. I'm not seeing that one much, though. 200X seemed like an upgrade for the expected niche, and that is an option with many current 2.0 packs. Ultra Grid seemed like it might be sacrificing some abrasion resistance for weight, so perhaps not the best choice for Bushcraft.
One more thing. I personally can't use my side pockets while the pack is on. This isn't a problem specific to SO, though. When sizing for heavy loads or long torsos, the pockets move up your back proportionately. The pack bag itself doesn't get longer, just moves up with the frame extensions to place the load higher up (4" higher, in my case). I use a bladder instead, and a 3L does fit inside the talon. I'm planning on moving that to between the Revo Panel and frame. I do carry extra smart waters in the side pockets, but need to take off the pack or ask a buddy to retrieve them for me. The pocket design would be awesome if I didn't need the extensions.
These are absolutely fantastic packs, but not that well known outside of the hunting community.
I already have an Olive XPAC Unaweep (non-breakaway version of this pack) from 2019, and just purchased an olive XPAC Fortress (discontinued, similar to Goshawk, no zipper).
Good luck on your sale!