We used LYNX, you can call them and they will tell you EXACTLY what to do, to be prepared, (exact change, route number etc)
We used them from TTC to Sea World. It is NOT disney transport, no it is not the same feel, but they are Cheap and efficient and Helpful when you call for inquiries.
Good Luck. If it were adults, I would not hesitate, kids...strollers, etc, a different story IMHO!