Wow! This changes everything. This is a fantastic way to get to the airport and I will never again pay for a taxi. The train is like the Heathrow Express in terms of its comfort level. Comfortable seats and good wifi. The station in the middle of Toronto couldn't be more convenient, and you can likely walk to your office or hotel if you're in the downtown core. And when I got to Terminal 1, where UP Express ends, the little blue train to terminal 3 was right there waiting for me and took 1 minute. Incredibly convenient and I will take again and again.