We use ZeroCater at Instagram and at least what we get has been consistently fresh and at least SEEMS healthy. They also make sure to take into consideration some of the vegetarians we have on staff. I'm not involved in the ordering process, but at least from the eaters perspective, it's pretty great.
They are usually very accommodating to different dietary restrictions. And the food is usually very delicious (SF has some amazing restaurants!) But restaurant food just tastes...heavy? I loved when we had Osha one day and grilled brisket + mac n cheese the next, but I certainly couldn't have that style of food everyday.