In order not to make too long a description I'll make a list of positive and negative points.
Positive points:
_The Big screens of good quality.
_interface And easy to use, fast and intuitive.
_Luminosité Quality and contrast (adjustable according to his wishes).
_The Sensitivity of the touch screen.
_The Relatively efficient micro.
_The Port SD card to listen to music (AAC format).
_The Cameras for fun and cool games (modification of photos) that can be transferred from SD card and / or Facebook.
_The Browser available although limited use.
_The Wifi significantly improve allowing more distance between the WiFi and the console.
_L'importante Battery life (up to 14 hours).
_The Preinstalled and programs offered (Dr Kawashima, Flipnote Studio that allows the creation of mini cartoons and Dictionary 6 in 1).
_Stylet Pen or by size of hands.
_Rétrocompatible With the games Nintendo DS / DS Lite.
_The DSi ware shop (various and original software).
_Grande Choice of games (for all ages and all tastes).
Mythical _Jeux (Series Mario, Zelda, Metroid ...)
_Prix Rather low and therefore remains affordable for "Technology digest" (touch, voice, wireless ...)
_ Quality overall console (I have several consoles of the Nintendo brand that some older (1987 and other more recent 2007 among others and they all still work, they are really strong, plus they have "survived" two free move become damaged in the pipeline, that is why I certify the quality of the console).
The negative points:
_Perte Port for Game Boy Advance games.
Internet _Navigateur too small (no videos and some pictures not allowed format).
_Appareils Pictures a little low (0.3 megapixels), but caught by the size of the screens and facial recognition to pictures of acceptable quality nonetheless.
Here I hope this summary will help you decide, I personally am very satisfied and I recommend it if you want to have a versatile console, quality and cheap.