I bought a base 15" (with upgrade to 512GB storage), shortly after they were released. It was crashing with the Bridge OS error up to 4 times a day, so I returned it for a replacement. I received my replacement on Monday, and so far after 3 days/nights not a single crash.
As with the first machine, I am using the Apple official adapter to provide power while also having a monitor connected via HDMI, and an external HDD. FileVault on, sleep/power-nap enabled.
I never migrate data from old machines - I prefer to setup new. Beyond the normal setup process of iCloud, locations services, etc, so far the only Applications I haven't installed on this new one that were running on first machine are: IntelliJ, Pycharm, Xcode, Python virtualenv, MongoHub, homebrew and SuperDuper. Planning to put those on over the next couple days and hopefully still see stability.
I doubt any of those installs should make any difference, and I'm not confident I won't see crashes with the replacement (my guess is this is a firmware issue), but will report back if I have any useful information after more time with the machine.