I like the PIA since I saw Onyx on Steve’s hands last Saturday. But I prefer Mirror Ball or Bruno for the look of it. Oddly enough Steve played 70% of the show on Jems or Universes, 20% on PIAs and 10% on the Custom Strat Jem and the John Scotfield sig more or less. I think that the 58 mm wide at the 24th has something to do with it.
Would Vanta even work on a guitar? I thought it was a like a powder coating that would easily rub off? If you clear-coat it for protection, that'll increase reflectivity substantially. Aside from gimmicky uses (e.g., YT vids), maybe it's just industrial/scientific applications?