I ended up buying a 3DS when it came out. Mostly because it was heavily discounted on Amazon. It still costs a lot more than other consoles in the DS range.
I quite like the machine, I just wish it had some great games out for it. It doesn't even have a game as good as "Project Rub" for showing off the features. Mostly what is out are sequels, ports and the most anticipated game is a remake of Legend Of Zelda Ocarina Of Time. I'd like something truly new, showing off some innovation.
The eshop comes out tomorrow, everyone gets a free copy of Excitebike 3D (which I imagine will be like the visualiser in the 3DS's MP3 player - an 8-bit game with 3D in layers, découpage style), and a free 3D Pokedex application compatible with Pokemon Black and White.
Quite fun, but still not quite the killer app.
I have played two 3DS games on cartridge:
* Lego Star Wars III The Clone Wars, which I borrowed from a colleague and finished really quickly (71% overall completion). It's not bad, but feels quite shallow and bland - not nearly as good as the Lego Star Wars games on Xbox 360.
* Puzzle Bobble Universe, which I bought for £12.99 on Amazon thinking "it's puzzle bobble, how could it go wrong?" but... it's far too easy, and there's no Arcade mode. I've started playing "endless mode" and it truly is endless - I've been going 7 hours now, I've gone past level 2700 now, and it's not getting difficult. I am quite bored, but it's against my nature to simply give up. :(
Super Street Fighter IV seems to be the most popular game around, from what I have detected on players I have passed in town, but I don't think I need another copy of that game. I already own it on my home consoles and haven't played it that much. Dead Or Alive Dimensions might be good, but I will wait for the price to drop.
The built in software is much better. Streetpass is kind of a meta-game, you seek out other people in the real world carrying 3DSes, to pass by and collect puzzle pieces, or work as RPG characters in a simulated quest. The games don't have much substance, but it's fun to think about where in town you're likely to find people with 3DSes. The detection seems a bit flaky though - sometimes it would pick up a friend's 3DS, other times not. Even if they were right next to each other, and could pick up other people's consoles!
Face Raiders - where you take a photo of someone and shoot little balls at it, as it's stretched to pull funny faces - is far more fun than I thought it would be. It's genuinely funny!
The 3D... I usually leave it on minimum setting, the less I notice it, the better it works, is my opinion. Overdone 3D is just annoying - I am hoping that people will "grow out of" doing it like that - a bit like when they first invented colour films and dressed everyone up in the most outgrageously gaudy clothes to show the technology off. It'll be better when they forget to show it off.
The 3D technology doesn't work at all on my brother, he finds it immediately irritating. Fortunately, all the applications and games look great with the 3D switched off. :)
3DS games are all region locked, but DS games appear not to be. I've been happily playing both European and American DS games. The screen size is larger on 3DS than on DS, so it's upscaled via software, and as with all different models of DS, the colours are a bit different. Some games (e.g. Ghost Trick) look great on 3DS, other games (e.g. Pokemon White) look a lot better to me on DS.
Battery life on 3DS seems great when leaving it on sleep mode for Streetpass, when playing DS games, and Puzzle Bobble Universe (but it does appear to be a very simple game). It was not so good with Lego Star Wars III, and I understand it's very short with some other games. I am mainly using it as a DS these days, so it's not much of an issue for me.
So, that's all I have to say about 3DS so far. Seems a good little machine, I use it every day, but is so lacking in retail games that sometimes I can't help but feel like I am the proud owner of a brand new Neo Geo Color Pocket. :/