Cartridge (other than Rega) with Rega RP10

Dyna has been recommended to me too -- but some people wax poetically about Lyra!

I have a Benz Micro SM on a newly acquired RP10 that I moved from an RP6.  It was/is beautiful sounding.  I had the original Exact 2 on my RP6, then a Sumiko Blue Point #2, then a Goldring Eroica LX and finally the Benz.  I called the Sound Organization and they advised to not shim, regardless the cartridge.  They said it was not necessary.  Being a little OCD kind of is in our nature as audiophiles so I get that...but I also don't like to waste efforts.  Does installing those shims simply make the user feel better or are people actually getting sonic advantages?  

dynavector 17dx and 2mm tonearm spacer.  done.