In my opinion YES!! They are so cool, I would say get it. It has alot of cool features and they are just AWSOME (your opinion may be different but as I said its just mu opinion)
Oh yeah! The Keitai is the current reigning king of the tamagotchis. I have a few myself. They do quite a lot and are super cute. The only thing I don't like about them is you can't debug them but oh well..
I got one when I was in Japan visiting my brother!!! But if you don't know how to speak Japanese or visit Japan a lot like me so you can hook up with a cell phone, it's not worth getting.