I loved these books as a kid, probably had the first 10-15 of them, probably more, and I'd always hang out at the bookstore and would check if any new ones came out. They were far, far better than "Choose Your Own Adventure", which I also loved, but FF was probably, I guess, the next level. I loved FF, and I especially loved the Lone Wolf books (different author/publisher), if anybody remembers those. I'd actually put Lone Wolf at a notch above FF. Still, FF has a special place in my heart. I got my daughter into them a couple years back, and she totally loved them, retelling me all the same stories I remember. Brought a tear to my eye.
I was a little confused about this because you can order FF books on Amazon today, but it looks like this new reprint will be a larger-size paperback format with the original artwork, which is awesome, because I did notice that the FF books I bought for my daughter had all new artwork, which was kind of disappointing, however the stories are pretty much the same as I remember. My favorites are of course, The Warlock of Firetop Mountain, then Deathtrap Dungeon and The Citadel of Chaos. Steve Jackson, I believe, also authored the Sorcery! series, which is another of my all-time favorites.
https://en.wikipedia.org/wiki/Lone_Wolf_(gamebooks) https://en.wikipedia.org/wiki/Steve_Jackson%27s_Sorcery!