At present, once a co-op adventure is in progress, I am no longer able to access my stored builds. Playing SP, this is not an issue; they load as normal, and as long as I select a build with the same characters, there's no issue. For a lot of adventures, this is clearly not an issue, but there are a fair few adventures where it's necessary (or there's simply a big advantage) to having optimised builds for different parts of the adventure. Having to do the change manually each time is an annoyance and a waste of my time. I can't see any reason not to have this be available; it's possible to do in SP, so why not in co-op too?