I use them Jacob. I shoot the Instincts, and have used both the provided stainless outserts and the FOCOS. I glued both the insert portion and the outsert portion into and on the shaft using the FOCOS on 6 arrows. I like them, and haven't lost an outsert in a target using them that way. I am going to try them just gluing the insert component next time to see how that works.
I have lost a couple of stainless inserts in targets, which is why I initially glued both components of the FOCOS.
David