Summary of my experience:
1). Don't expect to 'get in and get out' quickly. Since they cut all the meat as you order your sandwich it slows down the process. If you're not in a hurry, it's no problem. If you're trying to get out fast, you will be frustrated.
2). Sandwiches are pretty good and pretty consistent on quality. A few times they have skimped on the veggies, but in general things have been solid.
3). I believe prices are a bit on the high side, especially when you add anything like chips/drinks. Without a coupon, I would likely will go elsewhere.
4). I enjoy the Coke 'Freestyle' soda machine (push button where you can select from dozens of soda choices).
No complaints about the food. Speed could get better, and regular prices are a bit too high for this type of restaurant. The sandwich business is tough with a lot of competition. Port of Subs is solid player in a very crowded marketplace, although I'd love to see them differentiate themselves somehow.