I, too received mine a few weeks ago and couldn't be more pleased. Sound is more "freed-up" from the speakers than ever before. There is more separation and air between instruments especially towards the end of records. It's not a miracle worker: Scratches still sound, overplayed, groove-damaged records are still beyond help, and garishly-recorded strings and brass still sound bad. In any case, the protractor has definitely "raised all ships," so to speak, helping my VPI/Dyna 20xl get more off both excellent and marginal-quality records.
Set up took quite awhile the first night, mostly because of fumbling with best lighting and focusing and re-focusing my eye with the 10x loupe. A warning: I used only one eraser to stabilize the VPI platter and it raised the platter enough to throw off the alignment once I took the eraser out. The next night it took all of 45 minutes to get everything absurdly accurate, and that's what makes the protractor so excellent--that mortals like myself, (with a little patience and fortitude), can get everything so dialed in.
( At least if VPI drilled the platter hole to the exact millimeter, the record hole is in the right place, and the tonearm base...AHHHHHH!)
What's best about the Protractor is that it allows