Make sure to go there on a sunny and clear day. The restaurants at the top offers a great meal for a reasonable prices and one of the restaurant has a rotational platform so that you'll have a 360º view in an hour. If you're new in Berlin this is must visit for you.
You can see a panoramic view of Berlin from the top and it's really beautiful. We visited the rotating restaurant at the top and the food was amazing and the prices are reasonable.It's perfect to visit at sunset and enjoy the moment.