Considering that it's a jump from 4.7 to 6, I don't see the revolutionary changes that I was expected. Now, maybe as I use it more I will become more impressed, but I haven't yet seen anything to make me switch away from Seamonkey, even old beta Seamonkey. The guides are derived from the Audubon Field Guide books. I picked birds. You can enlarge the picture on this page by clicking on it.
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If you actually know your flora and fauna and want to do more than browse, every group has an advanced search. The field guides alone make it worth a look, but if they add everything they promise it's gonna be droolworthy.