I have used Bootstrap, Skeleton, and a few others. After a quick read of the docs, here is what I like about Pure:

1. It's lightweight.

2. It is stylistically plain.

3. The grid system is straightforward.

Care to shed more light on grid system?

As mentioned, I just started with bootstrap and found grid to work just fine for my usecases. What problems/annoyances did you face when using other CSS frameworks (which you feel Pure avoids)?

Basically - in bootstrap...etc, if you want to do something "nonstandard" by library view you need to carefully unmake all the defaults.

Here for example there are no default paddings forced upon you.

It all depends on wether you know what you want, or just need "anything that works - doesn't matter how and what it does".

Pure doesn't seem to support nested grids and column reordering, as both Bootstrap and Foundation do.

At some point I want to experiment with just how decoupled these big frameworks' grid systems are from the rest of the package. For example, can you use the following combinations:

Foundation 4 grid + Bootstrap 3 components

Bootstrap 3 grid + Topcoat components (Topcoat has no grid yet anyway)

Suzy grid + [Foundation 4 | Bootstrap 3 | Topcoat] components

etc.

I also want to performance test them all, using both Chrome dev tools [1] and Topcoat's Chromium Telemetry tests [2].

[1]: http://www.youtube.com/watch?v=Z1IqzeA3XXg

[2]: https://github.com/topcoat/topcoat/tree/master/dev/test/perf...

I kind of like the way Pure sets up their grid. Rather than doing bootstrap's row-and-column approach, you give things fractional widths, and what should fit into a row does.

Bootstrap has default/fluid/fixed to choose between, which can be confusing. In terms of mechanics, you nest .container, .row, and .span# and .offset#. It's just more complex.

I don't know how Pure does nested because I haven't tried it, but from reading the docs, it looks like you just put a new .pure-g classed div inside whatever cell you are nesting inside, then put the nested units inside it.

One additional advantage (that hasn't yet been mentioned) is that it supports older versions of Internet Explorer.

Bootstrap and Foundation have what Pure offers + more widgets enabled by javascript. Pure is analogous to just using bootstrap.css without the javascript. Short answer, No.