I've built some complex UI's with the same class name styles (Basscss). 99% of the time I'm reusing classes and I don't have to write anything custom.
Prototyping is great once you memorize the classnames.. Just write HTML, no need to switch to CSS files.
If you're working with global styles this is by far the most scalable CSS methodology as of right now IMO.
I don't know which editor you are using, but for TextMate I've written a 20 line-plugin that greps the tachyons.css file and gives me code-completion.
http://postimg.org/image/tq038rwqp/
I've built some complex UI's with the same class name styles (Basscss). 99% of the time I'm reusing classes and I don't have to write anything custom.
Prototyping is great once you memorize the classnames.. Just write HTML, no need to switch to CSS files.
If you're working with global styles this is by far the most scalable CSS methodology as of right now IMO.