If you buy a voucher without a confirmed time through a travel website, you will have to wait HOURS to get on the gondola. We had lunch in town then went up and were confirmed for a 4:40 PM tram. There was not enough seating or manpower to manage crowds at cafe. To leave, there were huge lines and wait times as well. By the time we got to the mountain, we only had a little while before it got dark. It was a long day with little reward.
The trip in the gondola was neat and the sledding was great...the overall trip was tiresome so I would only recommend going during the week or an off peak time.
Horrible, you are purchasing a non refundable voucher that's good for a ticket. You are not actually purchasing a ticket. We arrived and were advised it would be a 5 hour wait until we could get on the tramway. The voucher says that the cost covers parking but it does not, they charge you anyway. You can purchase tickets onsite so I would recommend NOT purchasing through Viator. That way if it's a 5 hour wait to get on the tram you can turn around without losing all of your money. Views were great but when it's 10 hours of waiting to get up and down the mountain it really is NOT worth it. It would probably be worth a 30 minute wait at the most.
Brilliant views, worth taking extra time to follow the many miles of hiking/walking trails at the top.