The other problem is that credit cards are set to go to chip-and-PIN in the USA (finally!) later next year. All the current readers won't be useful (at least if you don't want to shoulder the liability!)
[2] http://www.arcticstartup.com/2013/02/20/izettle-solves-the-v...
You will see all your cards get issued with chip in the next year.
Do you mean in the States, right? Cards with chips are the default in most european countries...