Not worth it. BFL might be shipping next week, and difficulty will be up 3x what it is now once that happens, continuing to climb rapidly over the next months as well.
It is not easy sending any money towards BFL considering the backlash of posts on this forum, and on others... but I feel like ASIC must be the way to go at this point. Hopefully Avalon will open up a 3rd batch, although Avalon's seem to consume way more power than BFL's are claiming to use?... not sure there are many of them out there to even verify actual power consumption, but that's what it seems like to me. It seems like BFL has the superior product... but seems a little unstable on the management/organization side of things.