I just got my DS lastnight and I already have 3 games for it. I was surprised on how extremely easy it was to set up the WiFi. I kind of winged it when setting up the IP address, but it gets a better connection than my computer.
My only gripe is that the screen could be a little bigger, especially for games like Dawn of Sorrows. It's not a big deal, but it would be nice being able to fully sit back in my bed to play without my hands getting tired after awhile.
I wouldn't have minded if the buttons were more like the ones on SNES, they always felt comftorable even after several hours of play. The stylus works a lot better than I originaly expected and I can't wait until more stylus based games come out.