Bitpay is nice, and they already offer POS Bitcoin payments (with an iPad). But I'm wondering about the speed, is it really usable? Maybe they use another system for POS as what they use for web payments?

I'm saying this because I did a web payment recently where the merchant was using Bitpay. The payment was only confirmed after the block with my transaction was calculated and included in the block chain. This means it took several minutes to confirm my payment. On the other hand, I paid for the new Humble Indie Bundle yesterday, and they use https://coinbase.com/‎ as a Bitcoin payment processor. There, my payment was confirmed in only a few seconds. That's the speed you need for POS payments.

But on the Coinbase web site I don't find anything about POS systems, they only do web payments...