Basically the Gamecube version but with some new added perks and of course the much easier WIFI. but the WIFI is very sensitive to finding access points. You also need to add friends to your friends list on your device before travelling to other towns.
If your a collector it's worth it to get it
If you only have a DS, then it's worth it.
If you own a 3DS and want something more elaborate and fun I'd hold off till earlier next year when the 3DS version comes out. Animal Crossing 3DS: New Leaf :)