THIS IS A GOOD ONE. EVEN JUST FOR YUKIKAZE ALONE.
Okay, the less fangirly take: Out of the books in this bundle, I've only actually read Yukikaze (which was great - military sci-fi with emerging AI sentience and an edge of bleakness). I attempted to read Self-Reference Engine a while back but didn't get very far, and I read enough of Good Luck, Yukikaze to be sad that it didn't work nearly as well for me as the first book.
Although I already own several of the books in the bundle, I'm definitely picking this one up.