If you have the stock Goldring cart on there, get something different.
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I have a relatively new MMF-5.1 and have not considered upgrading other than a Herbies mat just yet. When I do I will address the isolation with a solid wood base and substitute spikes in place of the rubber feet. Later a cart and possibly look in to fitting one of Projects carbon fiber arms. The cart and phono stage you choose will probably make the biggest difference for you.
I've had the MMF-5 for 4 years now. Definitely change the cart, other than that just leave it be. I think its not worth upgrading, the money is better spent towards a new table. I've tried lots of upgrades and found ultimately that the weaknesses of the table persist, and do so to a degree that its just not worth it.
A fine table for what its worth, but not worth upgrading in the long run.