There was an earlier flash that apparently didn't do anything but lower the shift-point rpm. Most people who had it done weren't to thrilled about it. During the last SRT engineers chat session, the new and improved fix was said to be about 4-6 weeks out. I don't know if that time table is accurate, but I'd wait for the new one to come out before having it done. Here's a link:
http://www.lxforums.com/board/showthread.php?t=32047