Going from a Gyrodec to a SME 10

Hi all,

I'm thinking about going from my 10 year old Gyrodec to a near new SME 10. Would this be considered step-up in performance or just a different audio reproduction?

Currently my Gyrodec is up to date in specs including latest never connected power supply. Also it has all the Orbe upgrades including platter and using a SME IV arm. The SME would come with a 309 arm.

I'm wanting to swap carts from a mono to stereo frequently so I thought even though I I'd have the choice of arms I'd use the 309 and not keep the IV.

The rest of my system. Using Harbeth SHL5 speakers with a Aussie built KT120 amp into a Aussie built MM stage then a audio Techinca SUT..

Any thoughts would be great..

Thanks all