I really haven't checked all the keys but I have had my G15 keyboard for less than a month(New one with 6 G keys), and suddenly the G1-G3 keys stopped working. I just got a new rig, Dell XPS 630i, windows XP, so I was pretty sure it wasn't on my end but just to trouble shoot I took the G15 and hooked it up to my HP pavillion Laptop(it had never been hooked up to my laptop before). Plug in, install drivers, and guess what? G1-G3 buttons still didn't work. Unbelievable. I guess from some of the posts I have seen that this is a defective product line and I will just either have to go with another companies gaming keyboard or roll the dice with Logitech again. If I do go with Logitech I think I will get the G11 that has more readily accessable G keys. That way if 3 stop working I will still have 15 left instead of going from 6 working to 3.
I am happy to say that I called Logitech today and not only are they replacing my G15, they are sneding me the previous G15 with the 18 G keys and flip up screen, sweetness.
Yes, very lucky indeed, I was on hold for a long time so i think my customer support guy, Matt, did some serious calling/asking around. He did a great job, and i am happy to get my hands on a first gen G15.