I went to Yodobashi yesterday and looked at one, and I honestly wasn't impressed at all (and I was looking forward to it since it was announced).
I can't stand the first position it clicks into. I'm never going to use it, and it felt really weird constantly hearing a big click as I open and close the device past that position.
Second, while it felt easier to hold, it definitely didn't look any better than the 3DS. I was imagining a big DS lite, which is quite the product (as are the DSi and DSiLL), but instead I found something that honestly looked quite cheap.
The low ppi also got to me, especially with NSMB. Mario Kart I felt worked better on the big screen, but (perhaps obviously) NSMB on the bigger screen looked as if it had the exact same graphics as the DS NSMB, which kind of felt like a let down. Monster Hunter didn't look too bad.
Lastly, with the lines/dot problem not going away (while those little bumps above the screen make the screens not touch, if you apply any sort of pressure when the device it closed they will (good old demo units!)).
So I think for now I'll be keeping old Aqua Blue, and continue to save my spending money for a white Vita.
Glad people are enjoying there's, but for me, the original still feels like the superior model. I hope the next revision is better, and then I'll think about trading in Aqua Blue for it.