Over the years, WestJet has become my preferred airline for travel. They are generally efficient, helpful and clean. The seats are also reasonably roomy (I'm 6'3 235 lbs) compared to some other airlines.
They are a value oriented airline, which is fine... I'm not on the plane for the food. The service is well above par compared to other airlines in that price range. As with most airlines, WestJet charges for checked bags. If you are a light traveller with an MLC bag that won't be an issue.
Our last flight to Portland from Toronto (through Calgary) was a breeze. Even the smaller Q400 prop plane for the second leg was comfortable. We left Ontario in the early morning, and thanks to the time change we were on the Pacific coast by mid afternoon ( including a scenic 2 hour rental car drive). And for the record, the Pacific Coast of Oregon is absolutely fantastic.