The Good: They were incredibly helpful and understanding when we missed our flight. Thankfully we got another flight out 4 hrs later and that was great because we got to spend time in their lounge. Full use of computers/internet. Free snacks and drinks (cookies, nuts, tea, and coffee). The seats were great and it gave me and my friend some time to catch up.
The plane is very clean and roomy. Getting to see the Toronto skyline both flying out and flying in was one of the best moments.
The Bad: Make sure you give yourself a lot of time to get to the airport. Even though the shuttle across from the Fairmont Royal York doesnt seem far from the airport, if you miss one, you'll have to wait another 15 minutes for the next (and that's what caused us to miss our flight).
It would be nice to see them open up more flights to other cities.
The Overall: It is more convenient for people who live downtown or don't drive. When they have their sales, NYC and Boston have been well-priced. Factor in the cost of getting to the Pearson airport or having to drive there, I'd rather fly with Porter.
Revisit: They're always at the top of my list when I'm thinking of flying out for a visit. I'd definitely go with them if I were to head to NY again or Boston.