I've tried the EXO and Kifaru and bought the Kifaru. It just fit me better. I really liked the layout of the EXO though. PIcked up a DT1 bag and guide lid so I'm set from day mode to multiday mode.
If you can find someone with the packs you're interested in and try them great but, to me, it was worth the shipping cost to try the EXO be able to send it back. Both companies have great customer service and Steve really tried to make the EXO work but understood when I decided to send it back.
