Used it every time we head north on I-15 and on the way back home. Never had any problems, although a few times it was slow going up to the 3rd level, but only about 5 minutes, not 45. Never had to wait, but have been the second one on the pair so slow starting in the charging, but usually not for long. Usually it is less than half full, and never saw any ICEing. Did see a San Diego employee Model 3 a few months ago. Since my wife was concerned with lack of instrument cluster, after they let her sit in the driver's seat she felt much better.
It will be nice when the new Supercharger on I-15, Lake Elsinore, a few miles north of Temecula, is opened. We plan to start using that one instead of this one when it does. Should be soon, I hope by the end of this month.
If you are visiting San Diego I recommend that you fill up at Temecula (or Lake Elsinore, when opened) on your way. If you do not use too much electrons while in San Diego then you can make it back to Supercharge at Temecula on your way home. The San Diego Supercharger almost ALWAYS had a waiting line of 10 minutes to 45 minutes or more. If you are able to plug in overnight where you are staying then you can do that also to have enough to get back to the SC.
As a side note, yesterday my wife and I visited the Tesla Store at UTC, San Diego, to see and sit in the Model 3. Lots of young couples there trying it on for size. It warms your heart. We got our invite last month but are waiting on the D model. Then we will be a 4-Tesla home (white Model S, blue Model 3, mini white and mini blue). Now the grandkids beg their parents to bring them to see Grandma and drive Grandpa's Teslas.