[suicideneil]

The MMPro case was redesigned recently to make the fan less suseptable to damage from small stones, and to allow better cable routing ( rx wires exit the case higher up than before ).

No older versions of the esc that were problematic that I know of, MMPro is very reliable generally, compared to older MMMs at any rate.

As for upgrading firmware- dont bother unless you are having problems with the version you started with, or there is some awesome new feature you really cant live without; as many PC geeks will tell you, newer firmware/software versions aren't always better...