My first impressions are that it is a very nice piece of tech, it looks great (I got the blue one) and is very nice to handle (having upgraded from the old silver DS).
The built in games (AR Games, FaceRaiders) are great fun and show off what the system is capable of although they don't have much depth, I have only played them for about an hour each.,Hopefully there is more to come regarding those.
The launch line up isn't particularly exciting and the only game i have purchased so far is Super Street Fighter IV 3DS. I would say I am impressed by the game and in particular the 3D effect which is fantastic. What the game lacks for in a one player mode its makes up for in a very competitive multi player, however the many encounters of 'spammers' does ruin the experience slightly.
I'm happy that I bought the console however it has a lot more to prove if it to live up to its price tag.