One of the more exhaustive reviews  I have ever seen on the Logitech G15 2007 Gaming Keyboard has been reviewed at BenchmarkReviews.com.

I had been wanting to upgrade my current G-15 but this very well balanced review by Olin Coles makes me want to wait for the next version. 

Anyways, mosey on over and have a look at what he is saying about this  otherwise very capable keyboard. 

Here's the link.