GURPS Biotech begins with a brief look at the basics of genetics, and as with all GURPS sourcebooks the scientific background, whilst hardly in depth, is sufficient for the average reader and quite understandable.
The book discusses the social impacts of the technologies described as well as their applications in a GURPS campaign. The flavour text, all of which comes from the mouths or pens of various characters descriped in an appendix, is entertaining and provides a colourful overview of each modification or technology.
The art, as with most GURPS book is black and white and not particulalrly pleasing to the eye, but his is hardly a major problem.
On balance, a good book that is well worth getting if you want to incorporate biotechnology into your campaign.