iMessage is still very... beta.

Hey all

Anyone else have problems with iMessage? I've been using since its first incarnation on Lion and have to say, it still suffers from the same annoying problems.

The one that frustrates me above all others is, receiving a message on your iOS device, then upon responding on your OS X machine, you get a "delivery failed" message, meaning you can only resend the message once the app has "refreshed" your message history.

Thoughts?