FWIW, I received mine from Newegg last Friday and it had 1.21NA on it. I have not updated the FW yet but guess I should to 1.22NA. Worked fine from Fri - Sun, but Sun night the router locked up or something. I couldn't access it via web interface and wireless dropped - had to unplug and reboot. Really pee'd me off since I bought this router to replace my Linksys which was doing the same.
So, is it best to go 1.22NA or 1.15? Are there known 1.21 lockup problems?