I do, I have one and my kids each have one on their accounts. I am not sure if we are buying again, though, as they are getting pretty spendy....
I have a 6 month membership on my account. My oldest daughter has a 1 yr ( Just got it, actually... she wanted the new Chili hamster that came with it ) and my youngest girl has a 6 month as well. Her membership expires in March so we will be renewing that for another 6 month.....she feels left out since I bought a 1 yr for the oldest.
They are worth it, I love the features that come with it....