I picked this up at a second hand sale for $1, and, allowing for inflation, that's about what it's worth.
I got the impression these stories were pumped out either early in his career (when he was still learning and didn't know any better), or late (when he didn't care and was just chasing easy money.)
They are dependant on surprise twists (the technique of hacks and amateurs) and the overall tone is one of pastiche or parody. The parodies vary from a lot of golden age scifi, kinky erotic horror, and even to his own work, with "Unholy Travesty" being a parody of his own "Unholy Trinity" - which would be fine if I'd read it.
The brisk little stories become tedious eventually, although there are a few great ones scattered throughout. My favourite is probably "The Runaway Lovers," which is one of the Grande gugenol/ erotic Gothic horror ones. It was both droll and a little sexy, channelling Robert E Howard and Gothic horror to portray a perverse and hypocritical world.
I think the biggest problem with this anthology is not the briskness of the stories but their lack of weight or conviction. It feels like a sketchbook: the barest outline of ideas that needed to be better developed.