As requested, thoughts:
Of course tastes vary, but there's a lot of stuff there that I'd probably never read. On the other hand, "The Doors of His Face, the Lamps of his Mouth" is worth the $15 all by itself. Same for Deathbird Stories. The Nancy Kress short stories are excellent work. I haven't read Connie Willis' "Inside Job" and IMO her writing has gone downhill pretty dramatically of late, especially since "Passage" which is absolute dreck as far as I am concerned.
John Brunner is always worth reading, if you like early-70s style sociological SF, and maybe even if you don't. Bester's "The Computer Connection" is certainly not his best work, but I found it worth reading. Mike Resnick is a good romp. I haven't read the Emshwiller short story collection, but she's a fine writer. "Babel-17" is early Delany, but he's one of the most influential writers around. And Octavia Butler is always a thought-provoking writer who does an excellent job with her characters. I find her plots less compelling, but she creates great characters.
There's certainly enough there to justify the price, if you haven't read most of it already.