I am using an Audioquest Sorbogel mat on my MMF-7. I understand that there are several other good mats out there, also. Keep in mind that the MMF-7 has an acrylic platter where the MMF-5 has glass. I have not heard the MMF-5 with a mat other than the felt one provided, but with it, it did sound more lively and resonant than the MMF-7. If you want to lessen the lively and resonant sound, then the Sorbogel will work well.
