Anyone using older Stax tonearms?

I have a new, unused Stax S-shaped tonearm and was wanting some input from current or former users. It would be part of a Merrill-modded AR XB table which currently has a Grace 707. Anyone have any experience with these?
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Dear Pix4work: I own the Stax UA-9N. Which yours? and where do you need some help?

Regards and enjoy the music.