Since I fixed my attention on the Thoth deck when I first started in the early '70s and never looked back, I haven't bought many decks. "Regret" may be too strong a word for what I feel for my less sublime acquisitions (Magickal Tarot, Mythic Tarot, Yaeger Tarot). Bart Simpson had a better word: "meh." That said, I did buy a small-format USGS edition of the Thoth Tarot that I could have done without, considering I have two sets of the large-format Weiser-distributed edition. The promise was that the original colors were restored and corrected, unlike my somewhat muddy-looking versions. I had to agree that many of the cards look much brighter and clearer (and I did get a couple of also-ran versions of The Magus in the bargain), but after that initial revelation I just didn't care. So no, no regrets here, just a pecking order of preferences that will most likely continue if (or maybe I should say when) I buy more decks. I might regret not having enough shelf space for all the ones I don't use, though.