Van Vogt has a reputation of his books moving as fast as Bester or E. E. Smith, but I found a more normal pace in this book.
The book is very much a forerunner of the original Star Trek TV show. It is 4 linked episodes where the characters in the book take on dangerous aliens while undergoing a voyage to another galaxy.
Like the Foundation series it has at its core a person who saves the day through a new super science in this case Nexialism, which is an integration of the other sciences.
The book is a rollicking space romp with lots of fearsome aliens, who are in many ways ahead of their time. Entertaining with a lot of throwaway ideas. It has the standard obsession with psychic powers in SF of this period.
Worth reading. Light and fun.