Should I buy a Kettleball?

I have been reading a lot about what a Kettlebell is and how it works. So I went on the Internet to see what they look like. The funny thing about them is they actually look like kettles somewhat. Anyway, I have been wanting to build up my arms and get rid of the flab so I thought I might buy one. I would love to get rid of the underarm wobble. I'm thinking what the heck I'll give it a try!