We stayed at the Zurich airport Hilton last week. No trouble with the Gold upgrades to executive floor and use of the lounge - didn't even have to ask for them. The rooms were small and nothing special but clean and functional. The lounge was better than the usual Hilton lounge, including a nonsmoking area - very unusual for Switzerland! The evening snacks were quite good - in fact, pretty much the same as what was served in the appetizers portion of the restaurant buffet downstairs. I have to agree with the earlier post about the Ice Queen receptionist, although she was completely proper - just not very friendly or welcoming. The receptionist at the main desk was excellent - a young woman intern from a Swiss hotel school who was originally from New Zealand. Very helpful with unusual special requests. Finally, there is a wonderful exercise course (a country road through forest and field) just outside the hotel.
Only real negative is that a lot of construction is going on in the hotel.
Hope this information is useful to you!