TextMate junky here, but I sure appreciated BBEdit trials every do often way back when I relied on Macworld discs to try new software. It was my go to application for a kid learning HTML/CSS.
I've got a fairly large investment in TextMate bundles right now (lots of custom stuff that makes life super easy for me), so I've been sticking around through the nasty alpha phase.
Overall? It's alpha quality. Just what it says on the tin. But it's not so bad that you can't use it for daily use.