My first visit to Six Penn was a few weeks ago, taking a colleague out for lunch to celebrate his move to a new and better job. It was a perfect place for such an occasion and the ambiance and design of the restaurant was upscale but relaxed.
On the menu, vegetarian items are marked well and I found the server to be knowledgeable and helpful in providing information about ingredients and options. I ordered a falafel sandwich and while not totally traditional, it was made in-house and was delicious. The ingredients were very fresh and the dish was not overwrought. The service was quick and attentive and our food was out quickly, though I might not recommend attempting a work lunch if you don't have at least 30-45 minutes available.
I am excited to try their food again, perhaps this time to see what good items they have on their dinner menu.