I've heard and read all the bad stuff about Corbin. And I believe that I need to put my experiences to, just to be fair and balanced....
I've had Corbin's on my last 3 bikes, and for me there has been no better seat. The first 2 I bought over the internet. Great fit and and immediate improvement over stock. I can ride 500+ miles in a day with a pillion, and get up the next day and do it again. When I bought my FJR I decided that since I live close to the their Ca factory in Hollister, I'd go and get it made as a "ride in". When you go to the factory for a "ride in " appointment, plan on being there for most of the day. They Custom fit the seat to you . You can stand right next to the tech that is making the seat, during the whole process. You can ask questions , and have them make any changes you want. The guy that did mine even said if you want a gel pad built in it, just have it with you and they will incorporate in to the seat as they build it. Before it gets covered they put it on the bike and you take it for a drive so if there is any problems you can have it "adjusted" to fit you. Personally I like Corbin. And I would recommend it to everyone. The key is to make sure that if you order over the internet, that you have very specific instructions included in your order of what you want in the seat. But if you can, the best way to get one is to do a "ride in".
Now as for their customer support over the phone or internet, the few times I have called them , I got a immediate response. But that was a few years in the past, and last that I have heard Corbin is up for sale. The owner wants to retire, and all his kids a successful in there own businesses . The Last time I was there. I was talking to the tech that was making a seat for my buddy. And he was talking to me about this.
GJA, I see that you are in Finland, so a "Ride in would be kinda hard. I would suggest to keep calling them (and keep the time zones in mind), And I would try to call them as close to their morning opening time as I could. I don't know what time that would be in Finland, but it might be worth setting the alarm clock , just to get a hold of them.