I went from Ref5SE to Ref6 and or was a real good upgrade and worth the money. I usually go in stages so I next upgraded phono stage from Ref2SE to Ref10 Phono. Another good upgrade. So the point is to do small incremental upgrades to different components.
maybe next year go back and upgrade from Ref6 to Ref6SE. I use money invested in current component to help upgrade to next component. Have been doing this for years
actually looking back I started with LS17, next LS17SE, then Ref3, followed by Ref5SE, finally Ref6:0)