How is it? This one's sitting on my shelf waiting (along with a stack of other Blish) for me to get the urge.
Very readable. Have started, as the introduction recommended, with the second of the four novellas that make up the volume. I like this format: 100-150 pages. (Don't be put off by the fact that the volume looks like it's a 650 page novel!)
He writes with such confidence, which I suppose was possible in SF then (1950s). In comparison, something like Margaret Attwood's recent Oryx and Crake seems so tentative.