I like the idea of using a CSS framework to simplify the layout of a page and also to rapidly prototype UI elements without having to write tons of code. If you need to slap some nice-looking buttons on the page then Twitter Bootstrap and Gumby have worked out as a quick option.
Originally I was playing with Twitter Bootstrap because it seemed like the first framework to gain popularity. The problem is that I use SASS so I started looking for an alternative that used SASS. I ended up working with Gumby and initially, that seemed to be the answer. But the more I used Gumby, the more annoyed I became with all of the base styles it forced on me. I ended up having to override styles set up in Gumby to get the pages to look the way I wanted.
Gumby does allow installation from Bower, but there are some issues because if you want to edit SASS variables, you need to edit the _variables.scss. Problem is that file is part of the Gumby installation. I feel like the SASS should be structured so you can do all overrides from _custom.scss and not touch any of the Gumby source files.
Last, as I read blog posts on CSS frameworks, I noticed lots of complaints about Compass being too complicated and big. I never quite did understand why Compass needed to sit on top of SASS. It seems like too many layers of abstraction. I did have issues installing Compass and conflicts with the version of Ruby I’m running on my Mac. I eventually got it all working, but it’s another process to run when it seems like I should be able to just run SASS and not another tool that sits on top of SASS.
After digging around I found an alternative in the Bourbon/Neat/Bitters/Refills family. I like how they break down their frameworks into pieces where you can pick and choose what you want from them. UI elements are not baked into the code but rather require the developer to copy code from the Refills examples. On the surface this feels less easy to use when you can just put a class on an item in Gumby and get badges or buttons, but long term, Refills addresses a more realistic use case. I’ve never been able to use any widget out of the box; na designer or product person will want the default look and behavior for a widget. It’s all great that Gumby provides a sample set of buttons, but I soon found myself fighting the framework to override the default looks. Refills lets you pick and choose what pieces you want to implement.
Also, Bourbon provides the same types of mixins that you find in Compass, but it’s built all in SASS so you can just run a sass watch process rather than installing and running Compass.
So for rapid prototyping, I would consider Gumby, but overall I think Bourbon is a more production-ready solution to a responsive CSS framework.