Comfort:
it would be equivalent to a Osprey Stratos or Gregory Zulu which is a upper mid tier hiking backpack. Osprey Atmos/Exos or Mystery Ranch Bridger is clearly more comfortable but bulkier.
Airline Carryon:
the dimension are very close to airline limits especially the depth. If over packed it won't pass measurements. Worse case they give you a hard time just pulled out the camera insert and claim that as your personal item instead of overhead.
Design;
the design is very similar to Shimoda Action X line. Difference is that instead of a rolltop it is now a clever expandable top pouch. I like this design more than rolling. Another difference is the shoulder straps are not replaceable. Shimoda has several different types to swap in. Even several for women specifics.
Build Quality:
it is premium level similar to what you would get from Peak Design or Shimoda. One nit pick is the adjustment webbing feels cheap. They probably elected to go that route to save weight. The webbing on the camera insert are more premium feel and wish they used that on the backpack as well
Harness system:
torso adjustment is similar to what Osprey has but also seem like a weak point. A small amount of material is what holds the should strap to the anchor points. The center yolk area is flexible and bulges a little. Depending on how you wear it might tickle your back neck. Padding on the straps are stiff and not supple soft. It will need a lot of breaking in. The shoulder strap width is also wide meant more for men. It does not fit the contour of a female body as well. Hip strap is sufficient but the back support are needs bit material. Other mesh design by Osprey etc hugs your body. PGYTech has mesh material on the back area but isn't a seamless extension down to the waist.
Access:
There are plenty of access, top, side, rear. One note about the rear panel is you can't wear the hip strap and rotate the backpack around to access like a Mindshift backpack. Must entirely take off the backpack to access the rear. Due to the zipper design holding the entire backpack together they included fallback safety magnetic latches. It is nice to use that when you don't want to fully zip up while it is on the ground.
Overall I am pleased with the backpack. There are definitely room for improvement, but solid for a V1. If there is a smaller version of this backpack my spouse would love to buy it. Currently their different sizes has the same torso adjustment range for all sizes. They all have the same width/depth but only difference is the length.