@KTC: I booked Union early at those odds last week. It's actually 75/10 now! Of course, Bayern should take this easy, agree it's great value for a regular big moneyline.
I wouldn't underestimate Union Berlin at this stage of the season. Yes it is still very young, but what is the probability usually that Union against Bayern is the most interesting game on a weekend? I don't Bayern to dominate the game easily. Union will try everything within their power to make life hard and it would actually make the overall situation in the Bundesliga much more interesting.
Bayern are not invincible. Even Bochum could shock them last season on a day when every shot on target also is a goal. Hopefully it is going to be a close battle.