If you don't have lounge access and are considering this property, I would strongly urge that you pay for it. The food and service provided is in the top 2-5 % of all Marriott properties in the United States. The location is good if you are working near King of Prussia, but it will be a hassle if you have to drive downtown as others have mentioned.

I cannot speak for breakfast in the restaurant as my last stay was prior to the renovation of the hotel's restaurant into the current Shula's. They give gold and platinum members free breakfast on weekends (including tip). This property does a good job of upgrading gold and platinum members. They have only one suite so it is highly unlikely that you will get it as an upgrade, but they have executive corner rooms with a bunch of windows and a good view.