This is the most addictive and enjoyable little machine ever! I've had my DS for around 2 years now and it's still going strong. It's fell on the floor a couple of times and survived, so it must be well made.
There are literally hundreds of amazing games available for this console and they're not all Brain Training or minigame-based, thankfully!
Buy one, you honestly won't regret it. (But I suggest investing in some screen protectors if you become a DS addict like me :P)