Can you give me your user experience and insight into the MagicJack online phone?

I will be living overseas (I live in America now), and was looking for a cheaper way to call home than using long-distance on a cell phone there. I found the MagicJack and looked it up, but got really mixed reviews. I finally went to Radio Shack and talked to the guy there who said everyone seems to love it, he’s only had one complaint, so I caved and bought it.

I’m still debating whether to crack it open and set it up or return it and get my 40$ back.

So, have any of you ever actually used one? How is it? Is it reliable? How’s the call quality? Would you recommend it or not?