This book has a broad, decent selection of sci-fi art. There are numerous different styles, and the artists get a paragraph or two in which to comment, provide background or insight into their methods.
I can't say I liked all the art. Some styles just didn't do anything for me. But if that wasn't the case, the book wouldn't have done its job properly.
It's well printed, bound and presented, and split into different sections for robots, space travel, war, etc. - that works very well to help bring some sense of order to often disparate styles.
A decent book with some superb art in it. Well worth buying.