I have both Square and Paypal readers, but I've used the Square reader more - it's really simple to set up and use, as long as you have a data/wireless connection when processing the transaction. If you don't have a good phone signal, the transaction won't go through - but you can manually enter the information using the app for when you DO get a signal, just be sure to write down all the info from the customer. The fees aren't that bad, since you can make up the cost of fees if you make a lot of sales. I like that Square deposits the money directly into your bank account, and you can request a new reader from them at any time.