Should i get a dsi and why?

Well I dont have a dsi but my friend does...and i really wanna get one...i dont have any ds so since that version came out it convinced me to get one...it is pretty much like a regular ds but with more features....it has internet, a built in camera with a slot for an sd card and the cool thing about that camera is that you can play around with visual effects, there is also a voice record thing where you can use voice effects too, and its also like an mp3 player....but the junk thing about it is that there isnt the slot for the old advance games....so i feel that you should get a dsi...if you do have a ds you can actually turn it in to them and then you can get the dsi for only $100