I love my OfficeLogix headrest. It says the patent is pending but let me tell you...it's just a matter of time before it's approved. I'm amazed Herman Miller hasn't bought this great company. I'm glad they didn't....because they're in my hometown (Columbus, Ohio) and their customer service is extraordinary. I love the headrest....it came fully assembled (no tools needed) and it slipped on to my Aeron chair in about 10 seconds and held firmly in place...no wiggle or movement at all. . EZ PZ !!!! It's so comfortable to rest your head back when you lean back in the Aeron and all the various ways you can adjust it is wonderful. Everything is very solidly built and you'd swear that Herman Miller designed and manufactured this headrest because it PERFECTLY fits the Classic Aeron Chair. Five stars all the way. Buy this headrest and save $100 to boot compared to "the other guy". that is so popular online BONUS: It was delivered in 46 hours from the time I ordered it on Amazon. Wow! Exceeds my expectaions.