+1The primary difference between the R10 and RS10 is that the RS10 comes with chrome lip and the R10 with polish lip. Also, R10s with Diamond Cut face is exclusive to Mercedes Benz. It may have changed recently and Diamond Cut R10s are now available to BMWs. Diamond cut is a higher quality finish than black, silver or chrome so that is basically the difference in price right there. Now, if you want Diamond Cut R10s with the chrome lip, like on my E63, it'll cost extra. HTH.