I have the SU racks on my XR650L, they're very nice but I haven't been on a serious trip with them yet, as my travel plans for this fall fell through.
Mounting them was a real pain, had to have two people pulling and bending the frame and rack to get it to line up, but otherwise very high quality.
I also got his aluminum panniers, which are also very high quality.
there's info about my getting it set up here:
http://www.geocities.com/wwbagwell/
click on the "lugage/racks" link
cheers,
wright
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Wright Bagwell
http://www.geocities.com/wwbagwell/