I upgraded my home sensor network to MySensors 2.1.1 last week.
Prior to that I was having connectivity issues....I would lose nodes from the network fairly regularly.
I'm happy to say that 2.1.1 resolved all those issues and everything looks rock solid now. Haven't dropped a node since. Yay!
Would have been nice to know about the change in startup sequence for 2.1.1 (new before() method), but other than that, a very solid release.