I have the Godis, which came with the bike. I think they're too wide, so I'm working on converting some Pelican 1550s to mount to the bars. I like the look of aluminum, but I tend to think plastic will survive better than aluminum in a crash. Have a look at what happens when you hit a rock or two with pretty good aluminum panniers:
http://www.advrider.com/forums/showp...6&postcount=32