When I first installed this application and everything went smoothly. But when I started it the first time, the loading never stopped. I have around 1500 messages, so that could be the problem.
In my opinion the amount of messages per person should be (optionally) limited, to allow faster usage.
I tested by moving messageing to another memory on the phone, and after that it worked like a charm. only about 10 messages there though.
So before there is a limit to messages displayed (more could be loaded if you browse backwards in the history of the conversation) this application is not very practical for me.
That said, I really like the idea and functionality, so hope that i'll be able to use this program in the future.