I just traveled from Seattle to Helsinki, connecting to a flight to Zurich on Finn Air. It was my first time on this airline and I was pleased with flights and service.
We were delayed slightly on both flights due to late arriving aircraft. However, when I heard the next gate cancelling the Iceland Air flight entirely in Seattle, I felt I could deal with a 30 min delay!
The Polar Route makes for efficient flying time from Seattle and Helsinki airport is well designed and attractive. Transfers are not difficult to make.
Meals were typical airplane food, but offered a higher number of vegetables than I usually see which I appreciated.
Finn Air is part of the One World Alliance which allows me to earn FF miles on Alaska which is the airline I use most, and Alaska points can be redeemed for flights. One World Sapphire and above have access to British Airways Lounge in Seattle and Finn Air lounges in Helsinki.
Summary, quality product, affordable, and part of my FF program. This makes Finn Air a winner for me.