I have the Prince Sign o' the Times super-deluxe box and love it. Missed out on the 1999 set, though. Did they do one for Purple Rain, or is the "Expanded" 3-CD set the most expansive reissue out there? But yeah, such collections are great for hyperfans. I have all of Rhino's superlative Replacements box-sets, plus deluxe reissues of the Pretenders' first two albums, Love's Forever Changes, and Lou Reed's New York, in addition to the two Springsteen boxes mentioned above. (Though I won't be picking up this Tracks 2 collection--my interest in his catalogue is devoted almost entirely to the 1973-87 period.) And while I know there's controversy about Giles Martin's remasterings, I've also really enjoyed the Beatles albums that have gotten the super-deluxe treatment over the past decade (Revolver, Sgt Pepper, The White Album, Abbey Road, and Let It Be). Recently I've had the gigantic Smile box set out for a spin in the wake of Brian Wilson's death. All great stuff for those who like deep dives into particular artists and albums for which they retain an abiding passion.