Just stayed for 2 nights.
It's your average Radisson Blu. After staying at 5-6 of them the color schemes are all the same. Still don't like it.
Pro's: location, very good American style breakfast (at least for Switzerland), also train station is maybe 3 min walk, spa area was huge and very nice.
Con's: location (not downtown), gym sucks

If you're looking for a roof, stay here.
If you're looking for swank, Park Hyattt downtown destroys it.

All in all I would stay here again. I had extra CC points and we had a last minute stay for 2 nights. Had I extra MR points, the hyatt is the place.