I run an F1 with the transformer pack for deer & elk. I like the frame itself, it's pretty compact and lightweight. With the pack attached, I feel like it's heavier than it should be when empty, but has a lot of versatility, and I like the positioning of the pockets. The system is very high quality.
When packing out elk, I did enjoy being able to drop the pack at camp and go back for more meat using just the frame. Hope this helps.