I've gotten this reward from Google devs twice now. First time it was tricky to find some things on the Google store: But I managed to get myself a nice medium-weight Google jacket and a Google cutting board (!). The second time was even trickier, I already had everything I wanted. I ended up getting my girlfriend a Google jacket as well - thankfully she liked it! Amusingly we get asked all the time if we work at Google, because of the jackets, which is not true. I considered lying to the strangers that asked but reconsidered and went with "I have a friend that works there and he got me the jacket." I've even had one lady on the subway start asking me questions about the Google search engine, unprompted. Tech-branded outerwear definitely results in some weird conversations.
I should mention, weird Google loot not withstanding, that I think this program is awesome. Giving Google devs an outlet for giving something back to the Open Source devs that they like is really appreciated. Obviously financial contributions are even better but that can be logistically tricky and this seems like an easy middle-ground.