Well, it looks like I am a minority here. Yes, that's right, I really didn't enjoy this book. To be honest with you, I only got to the page 200. I consider myself a sci-fi fan. I've read (and loved) all Stephenson's books, Philip K. Dick, Nylund, Bruce Sterling, and many others. There are very few authors that I don't like, and thinking about it, that was my mistake. A lot of people compare Cadigan with Gibson, and Neuromancer was one book that I really couldn't get through.
The problem with Synners in my opinion is that it tries to do too much at the same time. Timeline is confusing, the characters are introduced a dozen at a time, and after 200 pages there was a lot of descriptions about not so important situations and very little was told about the plot and how the different threads related to each other. Characters are very poorly developed. Visual Mark, who is supposed to be important, has no clear identity, and other characters that could be interesting, like the boy who could read and learnt Chinese, are just forgotten.
There are a few cool ideas in this book. The brain sockets and the whole idea about hi-tech music industry are interesting concepts, but they are just not enough when compared to the silly ideas like the nonsense hit and run, the exaggerated drug apologies and things like that man with the `graphic changing' cape, etc.
Bottom line, I wouldn't recommend this book.