I have used 3 of them.
Park n Jet - Least favorite as the buses that make the rounds to collect people are not all that fast or efficient. Sometimes they can also be "too kind" in waiting for morons to collect all their junk and lock their car (seriously...how can this take more than 30 seconds). Used this most often with work as they had aeroplan (work paid so why not get something back)
Park 2 Go - U of C Alumni discount. Shuttles were faster and the car waiting for you is kind of nice if you can handle what was stated above about some guy in the car gunning it.
Economy - Quick walk and cheap. You may even get the comedy gold of really cheap people using carts to get the weight to trigger the sensors to get a new ticket so they don't have to pay (I have seen this twice).
If the weather is ok the economy lot is pretty awesome and faster than the other shuttle services for sure.
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