Sometimes I feel like I'm one of the only people in the world that doesn't use biteSMS. Don't get me wrong, I really like some of the tweak's features, like quick reply and compose. But in my experience, it's not very stable and tends to clash with the stock Messages app.
That being said, you can understand my excitement when I saw 'Messages' pop up in my Cydia stream today. The new jailbreak tweak, by Ma Jun (the creator of Bulletin), offers up biteSMS-like quick compose and reply features, without all of the extra biteSMS fluff...