Is the upgrade here worth it?
It's preference; I think most people get it because it's a relatively cheap upgrade--get higher resolution and LED backlighting. I don't care for LED backlighting, so the WSXGA+ panel is easier on the eyes 'cause things are bigger and it is adequately big enough for almost anything you really need to do.
That said, it's worth it if you get it; you don't lose much by not getting it, but if your vision isn't bad, you have they money, buy the upgrade.