About 2-3 hrs extra battery life.
I dig my Red XL (Like Mario red). My wife (who gave the kid her original ds) won't think of touching the 3DS. She's been having me staring at these sites like a vulture for a price drop on the XL. It's nice. Fits my hands better. If there is a "blurring" due to any stretch, I haven't noticed it. And all my ambassador games on it look nice.
If they had launched a different color (i.e. purple or pink) she'd pay list for it. But right now I'm waiting. I'm determined to get hers SUB-150. The 179 at BB might do me but they need to throw in a couple games at that price.
Edit: It's definitely no Vita (I like my Vita) but it does have quite a few games that Vita will never have. Now, if only Disgaea would come back to Nintendo we can move on with our lives :-)