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Pro Huge number of themes
They have hundreds of templates on different categories that are readily available for you to use. They're also neatly grouped so whatever your niche may be, searching for a template will be easy.
Pro Great commenting system
They use Komento which is a commenting system with voting and rating options.
Pro Easy to install
You can get their themes and templates with a full-package installation archive. This breaks down the steps to install it in just a few clicks.