I'm quite surprised this isn't more widely-mentioned on this forum. For a time in the not-too-distant past (I'd say late 90s), it was a mainstay on US bookstore shelves, at least in the states I lived in and visited (the tarot section of any shop was invariably my first stop in any visit to a bookshop).
Maybe it was always the same copy just sitting there, but there it was in the tarot case along with classics like RWS, Thoth and Aquarian, and other improbable mainstays like the New Orleans Voodoo Tarot (both it and the Universal came packaged in distinctive boxes that one could spot easily within the case).
I believe the Queen of Disks was pictured somewhere on the box (or as a sample card in those laminated display books Borders used to have), and that turned me right off the deck even in a time when I collected decks fairly indiscriminately. Something about her bothered me.
We often wonder why certain decks remain in stock. I once created a thread asking why certain decks were mainstays on bookshop shelves, no matter how improbably so. I was thinking of the Universal by Maxwell Miller and the Voodoo as examples. This is not to say they are not quality decks (I have neither one), just that I wouldn't have thought either the art or non-typical structure in the former, or the specialized and decidedly non-Celtic or faeries theme in the latter would merit such ubiquity in the market.