Panera is a students paradise. Cafe style food and comfy booths accumulate to the perfect study zone. The "you pick two" combo is great and allows you to choose 2 items (soup, salad or sandwich). The Panera member card is actually worth carrying around in your wallet - sometimes you get a surprise free pastry or coffee.
Recently I did have an unfortunate experience at the Yonge street location. I went with 3 other students and upon completion of our lunches our plates were removed. Shortly after an employee came over and requested we leave immediately due to a "lunch rush" - however it wasn't busy.
Lastly the wifi login only lasts for 30 mins which is basically useless to any university student - but hey - the broccoli cheddar soup is pretty awesome!