Previous to ZeroCater, I was the first engineering hire at Justin.TV: http://abstractnonsense.com/life-at-a-startup
If that sounds like the kind of experience you would enjoy, email me (firstname.lastname@example.org) - we're currently looking for our first engineering hire.
(Sorry, Bill, I just couldn't help myself)
We've been using them for a couple of months now.
They have great variety. We had a controversial lunch at the beginning (some people loved it, some people hated it), but overall the quality has been great, the food yummy, and they've been responsive about customizing the menus to our needs.
If you want to eat ZeroCater, but not work there, you should come work with us!