Installed GW over the holiday but was out of the country and didn't get to test it. But I got bored in the back of the cab on the way back from the airport, so I fired it up, claimed my $10, loaded up the prepaid card with a little extra, then used my phone to pay the fare.
It'll be nice when there's direct access to a broader variety of credit cards. Having to go through the prepaid card, make sure it's loaded up with sufficient funds, and still always have that couple of dollars left unused ... kinda defeats the whole convenience factor.
So for now it's actually
less convenient than simply tapping my RFID Amex card (which is my go-to card anyway) on the terminal, albeit far cooler.
GW should come into its own when I can select which card to pay from, so I don't have to carry all those extra pieces of plastic around -- when it actually becomes a "wallet" rather than a flashy Google Prepaid Card, which it is at the moment.