I have it but I've never really got into it the way I did with AC:WW. I'd say its still worth buying though. My AC and AC:WW houses are probably filled with roaches. ^^;
It's bigger than AC:WW, the NES old school games, and you can get island-characters ... but that's all. :\
I mean with WW you don't have to wear that "dunce/bull hat"(as I call it), get different hairstyles, the fish and bugs are more detailed, and you can make hybrid flowers. You can also take it everywhere and wi-fi....