I installed Build 8776 Thursday night, not long after it was released, which probably makes me the first to try it.   We were in a bit of a panic because SM had locked up on both Monday and Tuesday, with the Tuesday crash causing data damage.    I installed the new release on a test system first, for insurance purposes, then on our production "mail store" server.    Both installs went very smoothly without problems.    48 hours later, the system continues to run well.