I found that the Herbies mat was a very positive upgrade for my Music Hall 5.1. I have never been much a believer in the difference a mat could make until I tried the Herbies. OTOH, it sounded horrible on my Linn, so trying for yourself is the only way. Cheap and money back if not satisfied.
Music Hall MMF 7.3 Question
What are some upgrades to the MMF 7.3 that users think have benefits such as cartridges and platter? Other than this table seems to react to cartridge upgrades rather well I haven't seen much else.