I bought one this year and loved it. It is a little annoying trying to sit down with it on, but it only takes a second to unbuckle it and set it to the side or in your lap. I hooked my Thermacell on one of the strap loops and it held on great, even walking around. I found the shell loops to be too small for a 12 gauge shell. I was able to get one shell into the middle loop, but no others would fit with a shell already in.
I put my mouth calls in the pocket on my right hip. Easy access and holds them all.
I put my slate in the left pocket.
I put phone, MRE items, water bottle, and tags in larger pocket on front.
I would like to see it exclusively use magnets instead of velcro, but not a major issue.
The one thing I might do before going out to public land this weekend is get a cushion and somehow attach it to the back of the loop. I am thinking I might be able to attach it so that it keeps the strap from loosening up, which does seem to be an issue, although it has yet to slide down my waist.
There is plenty of room for anything you might need in the turkey woods. I even plan to use it for deer hunting this year. I tied to talk myself into getting a vest but cannot justify it after using this waist pack.