I am quite happy about the UP Express service offered as it is quite efficient and stress-free in comparison to trying to obtain a cab or drive to the airport.
It is clean, spacious, and has free wifi. Although the travel time is quoted at 25 mins, it is often faster, which is great!
The downside is the price...still...even after reductions. In comparison to other major metropolitan cities that have direct access to airports, $12 each way or even $9 with Presto is a substantial amount. If you are travelling alone, it may be a good option; however, if you are travelling with others, it's still much cheaper to take a cab.