In a very interesting book, on a fascinating and inspiring topic, one of the key figures is making his ideas public, and does not convince.
Simon Conway Morris tries to undermine or oppose the views of S.J. Gould, and while he might scientifically be the most likely person to succeed in such a feat, he utterly fails to do so.
Conway Morris is very hostile to the views presented in Gould's "wonderful life", which were largely based upon his OWN earlier view, and does little justice to the man who brought him under the public (although by no means scientific, a task in which he succeeded extremely well on his own merit) spotlights.
Conway Morris's arguments are based upon 3 major arguments: that of convergence, that of cladistics, and that of disparity.
The first one is undoubtedly true, but trivial. Convergence can and will occur, but as it can be brought up by taxa belonging to extant groups, it has no bearing on the shape of the tree of life. Gould made no claim that ecological niches will not be filled - just that they will be filled later in evolution by more closely related taxa.
The second argument is irrelevant and misleading. Again, Gould does not claim all the Burgess shale's weird wonders arose separately - quite on the contrary, but he does claim they arose early on the tree of life. Every life form can be fitted on a dendrogram, so the fact you can put Opabinia and Sidenyia on the same tree, is irrelevant to the argument presented.
So we are basically left with the third argument. Throughout the book Conway Morris is claiming to have refuted the arguments of "Wonderful life", and as his own arguments are weak you are constantly waiting for him to pull the smoking gun. This appears not before about 15 pages from the end, and one is startled to see all of Conway Morris's argument relies on just one study - Foote's 1990 study of disparity in Burgess-shale and later trilobites. The conclusions arising from this analysis are in no way the clear cut evidence Conway Morris wants them to be: the debate is on between scientists as to their validity and implications, and more importantly - they do not even directly bear on the question of disparity between HIGHER taxonomic units (e.g. Phyla): the major issue at hand.
Thus Conway Morris's book fails to convince. It does however a fascinating story, and the most updated one today, of the wonderful story about animal origins. Conway Morris is modest in his claims to knowledge, and fully acknowledges what he don't know, or not sure of (this goes to facts, not arguments) and noble in his efforts to relate his story to recent conservation issues. All in all I'd read his book for the most updated info on the animals, and "Wonderful life" for the best philosophy of science