One massive benefit that I have had from Basschat is the realisation that being over 25 doesn't mean you have to be in a covers band.
For the last few years I've been in an originals act with, on the whole, other "mature" musicians. Great fun is had by all and I get an enormous sense of satisfaction from it when it all goes well.
I've also seen some great bands that I probably wouldn't have found otherwise, including (but not limited to) Burning Organ (SilverfoxNik), The Plan (WaynePunkDude), The Jetsonics (Low End Bee), The Alibi (Walman).