I have tried all the versions and I'm currently using 1.1.3, which is the fastest IMHO. I've had a couple of VERY small stability issues with messages, but everything else has been great and the performance gains more than make up for them.

The issues with messaging app that I had on 1.1.3 were that some older messages disappeared, but everything in the last couple of weeks were there as usual. Also, there was this weird thing where the messages app would be open, then absolutely by itself the app would blank the screen for one second reading "no messages," then the messages would reappear. This happened a couple of times in a row, each cycle would happen a minute or two apart, but then it stabilised and hasn't happened since. (I just sat there and watched the app without touching anything once I noticed it the first time).

The initial disappearance of the older messages only happened after my first reboot after installing 1.1.3, and that issue has stabilized since then.

Obviously, I recommend a backup of all messages and other data before testing, but I find this issue minor, and just wanted to describe it in case it helps lead to a solution.

Version 1.0.1. is stable, but is not quite as fast as 1.1.3. in my experience.