Should I Buy It?

I just got a DS for Christmas, and I dunno if I should get FT or not. Does anyone know what it's like? I might get it, but I wanna know if it's going to be worth $20...

I bought it when it first came out, and I really like it. There are new fishies to discover and there are some very nice new features in the DS version (like scrolling around your tanks, fish counter for each tank, and the ability to scroll through your fish).