Cool, I'm using it now. I just wish that I could set everything to look stock.
The only reason I like handcent is the pop-up feature actually sends my messages if I put the phone to sleep (unlike popup sms), and the icon is better on this one. I couldn't change the icon with bettercut on helix launcher.
Anyway, if someone can figure out the settings to make this look like the stock messaging app, (colors, what dates to show, etc.) then I would gladly give you my thanks. And I guess a google wave invite since that's the only thing I could really give away haha.