In response to my own question...
PCMag has a great review for the product, but if you read user reviews there are a lot of complaints. The main complaint is from Square withholding funds for transactions over $2000. Another complaint is that there is no customer support phone number, just an email that apparently goes unanswered.
This isn't looking quite as good as it was an hour ago...
http://www.pcmag.com/article2/0,2817...p#disqus-start
I see there are some other devices...
PayPal Here
Intuit GoPayment (Apple devices only)