Min looks like a nice attempt at a lightweight framework, but it is so minimal that I am not sure I could ever find a use case for it. One could easily start with something like normalize and get something up and running just as quickly as implementing Min. I like Bootstrap because I can rapidly lay out an entire application interface in minutes. From there, I can digg into the LESS to customize components and remove the stuff I don't need. Sure, you end up with a larger CSS file, but if optimized it isn't much of an issue.