easy to use and end-result looks great. the only thing missing is the ability to have related multiple filters that only have single select. (you can have multi-select but that complicates some web pages).
I am fan. There are pros and cons of course, PROS = fairly easy to produce beautifully responsive EG custom image/post/portfolio etc. galleries, love the power of the meta's and the customizable skins; decent tutorial resources out there / a big CON - the workspace is slow, and has some odd quirks (...don't you dare close that modal image edit window without saving)