After looking high and low for this teether (several Toys R Us' were out) I ventured into a Rite Aid while on vacation and found it.  My husband thought I was kidding when I said I heard great things about it. 

I eagerly gave it to my then 9 month old son and he loved it.  From then on, when he'd teethe, I'd give it to him and he'd be fine. 

He's 2 now and I find him playing with it once in a while.  So it's a pretty long lasting teether as well.  I wouldn't know how to change the batteries in it if I had too. 

We'll be getting another one for DS#2.  I just wished they came in different...