It gets you a bunch of bug fixes, pretty much. If you're happy to be on PR1.whatever, sure, sit on it. But I don't see why not. It's like opening up Firefox, and having it say it has updates, but saying "frak it, I don't really need updates", and not bothering. For months.

The really good question is, why not? If you can do it by app manager with the SSU, instead of by reflashing, I don't see a good reason not to update it. if you can't without reflashing, then yes, that can be annoying, and I say your device will be mostly fine without it, so if that's too much effort, you might as well not bother.

But keep in mind that the longer you wait the more likely something is to break because the new packages expect PR1.3 versions of things.