Magic Jack was reviewed on ConsumerReports.org blog, one of the most trusted sources of consumer product reviews. They called it "a great deal with a few limitations" and those limitations aren't anything that I didn't already mention on the magic jack reviews page or the main page.

This should add a little bit of confidence in your decision to try Magic Jack risk free

quote from blog.consumerreports.org

"The surprising result: Unlike most of the products hawked during late-night programming, our tests found that the Magic Jack actually works and could save you money—if you don’t mind a few drawbacks.

The Magic Jack works by plugging into the USB port of your computer, acting as an adapter for your home phone line. Calls are placed over the Internet—a VOIP service like Vonage or Skype, but less expensive—so you must have broadband Internet access and your computer must be on to make and receive calls. (Messages go to voicemail when the computer is off.)

Our tester made dozens of calls with Magic Jack over several days. Calls went through with no problems, and voice quality was generally clear, though less so than with a good corded phone. Some interference occurred when the tester tried talking while downloading a large file or playing an online game. If you can live with that, we think the Magic Jack is a great deal."