COlineman78
WKR
Did he say in the video or podcast that it is more rigid than the hunter? I would presume with the 1/8" hdpe that it takes some of the "bowing" out of the edges that he talks about people experience with the 1/16" hunter frame. If im correct in my interpretation, youre basically deciding whether you want a full frame with a bit more flexibility at the top vs a lighter stiffer frame at the top that has better ventilation and an unprotected center back. If a guy wants to use the load shelf frequently then it sounds like a guy may be better of using the hunter/tactical since it will not require the new sheet attachment that he talks about...obviously that depends on the weight of that attachment. If you hull heavy center loads like sand bags or stands then it sounds like he still recommends the tac frame.
The issue of bowing in the hunter frame is due to people using the hunter frame to do things they should be using the tactical frame for. If you are hauling awkward loads that will cause bowing you should be using the tactical frame plain and simple, but people just buy the lightest option and expect there not to be downsides. As for the new frame there is more rigidity, but keep in mind that they are simply carbon arrows; so if you tried to strap something like a keg full of beer to it, there's no way they are going to stand up to you cranking down around a curved object super hard and they will probably break. As far as the gap in the middle, it's really up to you if whatever you plan on hauling can come through the gap. If you don't want blood on the back of your shirt you'll need the new X-Pac sheet accessory that Aron mentioned; but any sheet of fabric/plastic would do.