I traveled with them from Gothenburg to Valencia at the end of July.
my luggage was delayed by 30 hours. I had to call their number in Switzerland and pay over 250 Euro to get the zero help I got. My luggage was delayed by 30 hours and the bag damaged. They referred us to a company called Dolfi for handling of the broken bag. They had zero understanding of my situation and where I was. Dolfi had several agents who answered emails as they don't have a phone number to call de. They tried to tire me out with unreasonable suggestions of solutions.
Ryanair's customer service handles matters better than Dolfi and Swiss air.
I regret traveling with them.

SWISS struck out on everything for a business class flyer.

1) Prior to being able to board the flight, they required that you stand in an extra line to have someone check that your passport matched your ticket. What is the purpose of having all of the passengers (economy and business) stand in a common line and then go to their boarding lines? It would have made more sense for the gate agent to make this check for the special (not economy) boarding lines.

2) The food was tasteless and cold. The menu made it seem that we were getting a Michelin star meal. The only thing with flavor was the raspberry that came with the desert.

3) The plane was in poor maintained condition. The carpet at my seat was not even secured to the floor. Where is the Swiss pride?

4) The layout of the business class seats must have been done by someone who never had been on a plane. The row in front of me had one seat, while our row had two seats offset to that single seat. My seat was the only seat in that section that you could not get up with out having the person next to you move. I thought that every airline with any common sense switched to the staggered business class seating. I guess SWISS did not get that memo.

I do not recommend nor will I fly SWISS for a business class again.

This airline sucks. They are not good at communication or customer support which is all an airline really needs. The website is the least intuitive software in the world. Pick another airline

This is not the first time that Swiss allow themselves to change my seat number although i have paid for it. This time they changed me from 9 to 19! Excuse is that aircraft changed, ok fine but why am i not getting the same raw number, any aircraft has the raw 9, and of course the change is always for worse, never for better. On top of it, they advise your seat change just 1 day before departure day and if you contact their live chat, there is nothing they can do for you, and they tell you to try to change at the airport.
I am travelling a lot, but this last minute practice of seat change i saw it only with Swiss. I am Swiss and i always knew that Swiss is the synonym of guarantee of high quality, unfortunately i am forced to admit that these times are gone, especially reading so many other negative reviews.

Avoid this airline. Delayed flights , missed connections and lost luggage. No Customer Service. An absolute disgrace of an airline.