So i have the e71 and there are a few flaws i found within nokia conversation. First thing is that you cannot read your messages within the application without having to wait for it to autoscroll to the side. Full conversations are not displayed like in blackberry's or iphones sms systems which contradicts the whole point of its development - to be able to view past conversations with a particular contact.
Speaking of "view", when you do want to "open" a message receive in nokia conversation, clicking the "options" then "open" results in the exiting of the application. In addition, when you receive a new sms and read it in nokia conversation, the notification for new sms remains in BOTH nokia conversation AND regular messaging - Silly, as it is supposed to be a fully integrated software.
Lastly, creating a "new message" results in the application creating a new message like your phone normally would. I would expect something along the lines of "create a new conversation" where the interface is exactly like it's supposed to be in nokia conversations and not how your regular sms-ing is.
The concept of nokia conversation is great but however, for Christ's sakes, look at the already existing types of software that do similar things i.e. blackberry's sms system, iphone's sms system, and even the shitty (can i say that?) sms diary. I would have expected that the above issues would not even have been issues even in a beta release.