It works awesome, just need to add compression straps and swap a couple buckles and they're perfect together.

I had an Exo K2 before(well, still have, need to sell), and while it was great, curiosity got the best of me and I got a Kifaru frame to try. I love the kifaru frame, but also love the Exo bag layout more than any other. Luckily for me they fit really well together, and the Exo bag is a bit lighter than similar offerings from Kifaru.

Bonus mix-ups, the Mystery Ranch day pack lid fits really well on the bag, though I don't usually use it, for weight savings.