The service I just used for the first time and it's amazing that gets you to downtown Toronto in 25 minutes.
Trains are brand-new and are super-clean. There's lots of space for your luggage.
With crazy traffic in Toronto and all of the hard things during rush hour you can now easily get to and from the airport and not have to worry about braving the 401.
The cost was a little high 27$ one way. But for $44 you can get a return ticket and that makes it a little easier considering the time and hassle it saves you.
It reminds me of the train at Vancouver's airport.
With Uber transit from the airport, I Amy not rent a car again!