I've been vaping Nostaligia for about ten days. My diary of short reactions goes like this:
Day 1: "Pretty good."
Day 2: "Definitely good."
Day 3: "Really good."
Day 4: "Great."
Day 5: "Really Great."
Day 6: "Wow, this stuff is insanely great."
Day 7: "Yikes! My 5ml sampler bottle is almost empty!"
(Later on Day 7, I ordered a 10ml bottle of Nostalgia.
Day 8: "Why didn't I order a bigger bottle?"
Day 9: "Oh no! The 30% off sale is over, and I desperately need a 30ml bottle of Nostalgia!"
Day 10: "Aaarrgh! Where's my shipment from Prime Vaping???"
For me, Nostalgia is in roughly the same class as Boba's Bounty. Complex, with some hard-to-pin-down flavors (not so mysterious as Boba's, but in that direction). Doesn't knock you over at first vape, but steadily grows on you. From interesting to great to grand obsession.
Along with PrimeVaping's Natural Tobacco and Vermillion River's Kentucky Premium, Nostalgia is a contender for Next Generation Classic Juice.