Thorens TD320/sme 3009s2 Any experience in combo

The have had a Thorens TD 320 MKi with a Thorens TP16MKIII tonearm and a Shure M97. I have recieved a suggestion for upgrade and that was a SME 3009s2 tonearm (ebay about $300 ?) and a nice MC (Blue point, Dynavector). Has anyone else tried this combo ? What is the difference in sound ?
Is it worth the upgrade ?

Thanks !
Frano