Yeah, seems disappointingly quiet.
It is a pretty mature, well documented piece of software so I don't think you should reject it completely just because there's no active support/development, but it's probably something to factor into your decision making.
I'm using it in my game, but only for my local multiplayer. For internet multiplayer I was planning to go with Raknet (and have working code for it), but ended up going with gamecenter instead. Although that decision was mainly to avoid the burden of paying for and running matchmaking facilities.