I've seen terrible, terrible binary sizes with Eigen + debug symbols, due to how Eigen lazy evaluation works (I think). Every math expression ends up as a new template instantiation.
In terms of compile times, boost geometry is somehow worse. You're encouraged to import boost/geometry.hpp, which includes every module, which stalls compile times by several seconds just to parse all the templates. It's not terrible if you include just the headers you need, but that's not the "default" that most people use.
