I got a DSi XL in the mail the other day, thought I would give a little review for you guys:)
My first thought when I saw the package was "Wow the box alone for the DSi XL is huge", upon opening the box, I found that so was the DSi XL...
Here is a little size comparison:
On the box it says it's 90% bigger than the DS Lite screen, here is a little diagram that shows that.
I haven't played a DSi extensively, but it seems to have all the same features as the DSi, just with bigger screens, which is to be expected, since it's just a DSi with XL tacked on. One thing I did notice, is the DSi XL is slightly louder than a DSi. Also, it comes with a bigger, full size stylus, about the same size as a pen.
Overall I'm glad to have this, the bigger screen is certainly an advantage for graphics, games, and your eyes.