I like the product and am excited for the team, but $10mil seems a bit high to me for a pretty early product. I'm assuming that this will eventually roll into Google wallet as a competitor to Square's card case.
In any case, this is great news for the young team - looks like they'll continue their work but within the confines of Google. Looks like Dave McClure's hypothesis is getting stronger by the day with a few 500 startups companies getting snapped up recently (Backtype to Twitter and Cardmunch to Linkedin).
(disclosure- we're a fellow 500startups company - go 500!)