Well, to be honest, I lacked the time to go in depth on the links and make sure all the needs were met. Instead just providing resources for Matt to review as part of his job.
I base my comments off the number of businesses I have seen that successfully function off just an iPad, or an iPad and Mac combo. I'm sure Android isn't a barren wasteland in this regard, but experience from traveling from two months along with local experience in Austin and Seattle has never revealed an Android solution in active use. Now there are still plenty of Windows POS and other solutions in use too, and those outnumber iOS by far. However, with the tablet requirement, I doubt any of those Windows solutions are Windows 8/tablet ready, due to the newness of that solution.