On week nights, usually one spot open. If occupied, a 5minute wait should be fine. I passed by this Sunday and didnt charge, on my way up, i saw one Tesla leaving the parkage. Once I arrived at the SC, there was a newly arriving tesla waiting for a spot. So yes, it is quite packed on weekends. But The turnover is pretty good(having to pay for parking helps). I must commend this red Century 21 tesla there for not SPOTing, I see him quite often and most of the time he would charge and park near the SC. I guess he works there or lives in the area and does make a good effort to park else where after charging.
Food for thought: I think the problem of SPOTing is smaller than crowding out by professional drivers. Imagine those uber taxis or hotel Tesla getting free charges, they would crowd us casual drivers out. I personally don't think super charging should be free and should be quota. Then the people who really need it will get it. Now it has become a game of let me drive as much as I want since its free. It is neither environmentally friendly nor helps with loaded chargers.