I also have the crown ones, and they have worked great. Actually, a front one sustained damage from the tire (hose came loose and made contact with the thread of my MT's) and survived to get me home (of course, all the rubber coating was gone, but the steel part survived).
I recomend also SS ones, but make sure they are covered in something (plastic, ruber, whatever), because otherwise dirt will be trapped in the dirt and act like a saw...
Felipe