After less than three hours with it available for free (appears Amazon starts the free promo day usually within the hour after 6 AM EST), already have more downloads of my debut novel than I had in the first six weeks of availability. Sales rank information seems to have disappeared from the kindle page for a while, so will see if Amazon algorithms reinstate that later in the day.
With limited information so far, will have to see how quickly information for authors becomes available as the day progresses. Will say I’m pleased overall so far with it.
The link is here.