As an update on this, I hunted it several times, once taking a decent 9 point that was really to young but it was a quick shot (rifle) with no time to look him over well.
Overall thoughts on the platform:
It's the most efficient, no fiddle factor, way to climb/hunt that I've used. Climbing is fast, setup is nothing as once you reach height, that's it. After using it, there wasn't a single time I climbed/setup mobile when I wasn't wishing it was as quick and easy as the PP.
It's the lightest "system". It's the weight of most platforms....with nothing else needed, so it removes the weight of whatever your climbing method is and even the ~8oz of a strap that most platforms use (and sticks).
It's not as solid in attachment as most platforms. It will move a bit. It didn't cause me issues but it is a factor. On the pro side of this, it gives the freedom to reposition/change angle with no more effort than rotating your tether and lifting your feet in the platform. I did this once to keep the setting sun out of my eyes. Very easy to change height up/down the tree if needed to position for better shooting lanes. This was nice when you setup before sunrise and need to make a little adjustment once you can see.
It's not as comfortable as a standard platform. The sides of the platform have the braces for the belt so they change they way a user can place their feet. It's fairly comfortable to put feet directly on top of them though. The foot bars that meet the platform in 2 different places remove a lot of usable platform space. In the original this was needed to allow the post to fold down. Unless they are required to strengthen the platform it would be better if they went straight across or at an angle back to the rear of the platform. My brother in law and nephew are both welders. I may get their thoughts on cutting/rewelding these in a format that will leave the middle of the platform open. If I do this I understand it will void any warranty - but I'm not really sure what PP's warranty is, maybe 1 year?
I tried carrying it as a pack with straps connected directly to it. Once with the band pointing down - this led to the teeth digging into my back and was very uncomfortable. Once with the band pointing up - this led to it always pulling away from my shoulders. Band down will work if I use a pad to cover the teeth but adding more crap is irksome. Carried with a Popup 28 and with a Modframe where both great.
The aider is a little tough to use on the last step onto the platform. I do wish I'd gotten the longer aider but the 3 step is fine.
After using it a bit, it was pretty easy to go around single limbs while climbing. I'm not a flexible guy but it wasn't bad at all. The rotating pin is an excellent design. Edit to add - it was very easy to change the pitch as needed while climbing with this as well.
There is a challenge on a limbed tree of moving the tether around them. I attached a short tether (girth hitched what is normally my linemans), then moved the tether/repel rope. If it's girth hitched, it's important to keep the rest of the rope contained so it passes through easy. I used a lattitude operator pouch which is easy to connect/disconnect. I did use a standard quick link to climb a few times. It works, but girth hitching is better. Original reason for using the quick link was thinking it would be quicker to disconnect/connect when passing limbs, but I really think it was quicker to pass the operator through than to mess with the quick link.
As an overall, I really liked it. The efficiency, lack of fiddle factor, quickness to be ready to hunt, and light weight are what I like most about it. If I'm going to hunt from a platform (that isn't already preset) I can't see myself carrying anything else.