Yes. I have used it with a unipi ot, but not the VPI
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The pivot point is the center of the tonearm housing. You have to kind of guesstimate where that centerline is but with a little patients you can get it pretty close. I have used the GEO disc to setup VPI, Graham and Jelco tonearms. But as you stated earlier you really can't see the pivot point and that is the one flaw with the GEO Disc. You will be able to get it close with your cartridge setup but if you want total accuracy I would recommend the Feickert Universal Protractor.