We had Touratech Boxes and racks for our round the world trip. So far after 17000 miles, 6500 off road miles. The racks have been fine, Angies boxes have been swapped for Wolf man expedition dry bags as she damaged her boxes in falls. My boxes are still ok but if I was buying now I would go for a TT or SW Motec rack with 1550 pelli case's.
www.twobikesrunning.co.uk
hope I helped a bit
Paul