Yep, mine split a few weeks back. Both of the uppers split and lowers are fine. They sent me 2 extra uppers with the original purchase for some reason although they are a few millimeters shorter. I also did not overtighten them. I leave then loose until I ride and then tighten them before I go. It's bullsh** but what else can I do. The buffering causes the fractures in the spacers. Nothing we can do about it except keep replacing spacers I guess. On my planned trip in a few weeks I'm packing my OEM windshield with me just in case as the chance of the spacers splitting again is high. There still doesn't seem to be a good aftermarket windshield out yet.