This was Disch's first SF novel in a long time when it came out in '79. Some consider it to be his best work, but I don't know about that. I certainly thnk it's great, and that it deserved the 1980 John W. Campbell award for best novel of the year that it won, though. It's a shame it didn't win a Hugo or a Nebula, this is far superior to Arthur C. Clarke's "The Fountains of Paradise."
If you liked 334, you'll probably like this. Disch's greatest strength has always been his social commentary. This book is an excellent example.
In addition, recently a lot of books by this publisher (Carrol & Graf) have been going out of print (BOO!). So you might not have long to get your hands on it in a normal book store.
Still, you should read Camp Concentration first, to see if you like Disch's style. If you like it, go for his other two classics (this one and 334).