[jeztek]

I think there's still value in hiding the conversation from the server even if you must still trust the server to not behave maliciously. If some three-letter agency contacts the server operator asking for a back channel to listen in, he or she could respond that it's not possible without malicious intent towards a user:

http://www.macobserver.com/tmo/article/apples-imessage-encry...

[RyanZAG]

Point taken, you're correct - 1.1 is bigger than 1.0, and if the choice is open, choosing the 1.1/semi secure option is definitely better.