Until last thursday (July 2nd), I was a PS3 only owner, but on that day, my mother got me a DSi. So, now I've had it for a couple of days, along with Elite Beat Agents and Lock's Quest.
Design: I really like this, it feels much smaller than I had imagined it to be. Which probably says more about my imagination than the DSi itself, but still. I don't like holding it like a regular controller, the button placement isn't very good for that (when using the shoulder buttons at least). The menu also feels pretty good, though I imagine finding stuff can get annoying should you ever move towards filling it up...
Quality: Again, very nice. There isn't really anything else to say here, it feels like a solid piece of hardware.
Features: The cameras are surprisingly good considering the resolution and quality you might expect from such small cameras. The different "lenses" usable for the camera also add a bit to the fun, though in the end, it's still a gimmick (for now anyway). I still don't understand why it has a mic though, it feels even more gimmicky than the camera. The touchscreen and stylus both feel good though, and feels well used as well. I also like the internet browser, it went above my expectations, as it handles quite nicely.
DSi Ware: Right now, this is extremely underwhelming. I know that it's a relatively new service, so obviously there won't be much content, but I still expected more. I don't know how much I am missing out on by being in PAL though.
All in all: I like it. It feels sturdy and has some nice features. I'm still waiting for it to blossom so to speak, but at this point in time where I only have two games, that's exactly where it should be. I'm being held back by my budget though, so getting there may take some time.
Thanks for all the advice I was given in my earlier thread!
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BONUS! I'm giving mini reviews of my games!
Elite Beat Agents: So far, I've completed every song up until the one where you have to help that ninja guy. And the song is kicking my ass! I refuse to go down in difficulti, because the one-star difficulti feels like something that was made for my grandmother, so I'll just keep trying! Other than that, I like it 
Lock's Quest: Pretty good. It took some time for it to start picking up, but the gameplay is very good. I just wish the controls would have gotten more polish, they feel a bit too loose. And the pathing sucks. If you want Lock to go anywhere fast, your best bet is to hold his hand, because if you just press a spot for him to go to, he will most likely take an unnecessarily long road there. But nothing gamebreaking, apart from the few times I've gotten stuck for no good reasons (moving past an NPC or turning a corner for example), but they aren't really gamebreaking.
