Don't Install It If You're Worried About Android 6.0 Problems
If you're having an excellent experience on Android 5.1.1 or something older, and you're in no hurry to acquire the Marshmallow update's features and fixes, you might want to take a raincheck for a few days or perhaps, a few weeks.
We're already seeing Nexus users complain about Android 6.0 Marshmallow problems. They're not isolated to a single device either. They're impacting the Nexus 6, Nexus 5, Nexus 7, and Nexus 9. We expect problems to continue to emerge as the roll out gains steam.
There's no way to predict if you'll run into problems so all you can really do is sit back and wait for more Android Marshmallow feedback to arrive. Now that the update is finally picking up steam, we expect to see more feedback emerge later this week and next.
If you're feeling leery, wait a few more weeks. There's a good chance Google will issue an Android 6.0.1 update that's focused on the most glaring Marshmallow problems. Last year, we saw an Android 5.0.1 update roll out less than a month after Android 5.0 first arrived.
Again, while Android 6.0 is exciting, you don't have to rush into an installation. Wait until you're confident in its performance and features.