I found this to be a fun read. The first half does a pretty good job introducing the lead character, who is described on the back cover as "an average programmer from upstate New York." He has a lousy job, working for an incompetent boss. He's stuck in a loveless marriage to his TV-addicted wife. He feels oppressed by the financial institutions he's forced to deal with and his finances are in shambles. So he decides to do something about it, using his computer skills.
Another reviewer wrote that "the author doesn't know much about computers." I preferred to read this as a science-fiction story, with an emphasis on "fiction", at least where the technology was concerned. A lot of that didn't make much sense, but I kind of glossed it as the story carried me along. The book was published in 1979, well before everyone in the world knew of hackers and viruses and cyber-crime, and well before everyone had a personal computer or three in their homes.
The book is no literary classic, but I found it very entertaining.