That being said, after taking a quick look at the front-facing material on both sites, I have a question for you/GoPago: While the point you make about the initial cost being higher (about 1k with iPad) is valid, Square seems to run a pricing scheme where they charge a flat $275 per month and get rid of any extra cut they take.
Just based off some rough math, assuming the business processes $200k worth of transactions per year (about $550 per day, very reasonable) merchants will save about 2.5k per year if they use Square. For more slightly more successful businesses who process upwards of $500k-1m per year the delta grows even larger (upwards of $26k).
If the merchant runs a 1-man business which processes maybe $50k worth of transactions per year and uses Square's charge of 2.75% per swipe, he'll still be saving approx $300. And he'll own the hardware which inherently has resell value.
What specifically does GoPago offer over Square which is worth at least $300?