I am, as well. I have a MR and it's very comfortable but also very heavy. It would be good if I could lighten everything up by several pounds - especially if I can do so on the larger pack sizes (NICE frame with 6500 is 10+ pounds).
The concept behind the Kuiu looks really good - I like the load sling/meat carrier idea. I use a MR NICE frame with Crew Cab right now for that very reason. You can take our a whole deer or a elk quarter without having to go get a packboard first. Since I don't usually hunt anywhere near a road, this is pretty convenient.