[id]

Is it advisable to just use plain old CSS these days?

[Partyfists]

Hey Id,

I'd say learn how CSS works first and really understand what it's doing. However, Sass can help you write very maintainable efficient styled code.

I will always recommend using Sass, but only if you know what CSS you're making and know that it matters what CSS is being output.

[fenier]

In general, you get more out of using a preprocessor.

In practice however, the generated output isn't always the best, and it's worth a look over to make sure it's not generating slower selectors.