I haven't had a chance to attach my Argali to it yet. Will do that this weekend. Initial impression is that it feels super lightweight. Will drop it on a scale though. I got the UL and it is very rigid. Glad i didn't get the Lite with 1/8". Without a load though, I felt like it was super rigid but yet still moved or flexes enough with your body, draw movement's, etc. Looks like you wont have any problem switching out the composite stays with carbon arrows if you'd like. I am in-between a small and medium belt. Went with the medium and the fit is perfect.
If I could find one thing to complain about it would be that the rhino imprint or stitching on the lumbar pad is missing the top part of his head. This is the rhino imprint that actually touches your lumbar. Hardly anything to complain about though.
It feels great on the back. I have had their bikini frame and their last version. I feel it lands smack dab in the middle of those two in regards to weight, flex, airflow, etc. Will report back after i load her up and put some miles in.