Which route/airline did you book and which class?
LX JFK-ZRH upgraded with eVouchers from Business (P) to First while it's possible.

How many pax and how many award miles?
1 pax, 2 eVouchers

How many days/weeks/months did you book in advance?
4 months

Have you been able to book your preferred dates of travel?
Yes

Were you happy with the award booking procedure (e.g. online/by phone)?
Yes, found a very attractive P fare which I managed to upgrade to F

How often did you have to check/call until you got the seats?
I checked ExpertFlyer and knew my flight was F8A8. I booked a ticket online and immediately upgraded one segment on the Star upgrade website. If the upgrade didn't work I could have cancelled the ticket straightaway.