We did this with a party of 6 on Feb 22. I used mouse watcher to find the reservation, it was sold out initially. I wanted the 22nd but that never opened up that I saw. We got there 1 hr before the fireworks, at 7:00. We were seated along the edge pretty much in the middle. They carried a sign that said reserved with them as they seated us, and put it on the table then. The food and drinks were being put away just before the fireworks started; during them you could have grabbed some stuff but not everything and I doubt you could get alcohol but didn’t check. After the fireworks ended there were a few leftover food items that were consolidated and put in the center of the buffet that you could have taken . We were not rushed out or told to leave. We went to the bathroom, then just hung out for maybe 10-15 min. Initially you couldn’t even see ground in the hub, after 10-15 min it was decently cleared out. We left then, I think there was only one group after us. But they didn’t seem to be pushing anyone out or saying you had to leave. As for the view, it was off center and there was a tree that blocked a decent part of the bottom of the castle. However, to me it was worth being able to sit and eat and not have to stress about getting a spot in the garden. That area looked packed when we passed on the 22nd. If I did the pre-party I would be too anxious watching the garden fill up and not be able to enjoy the desserts. the after would be better, but we would have spent an hour before sitting in the spot in the garden, so it would take a lot more time. I felt the view trade off was worth it; it seems that most people don’t agree!
FWIW I didn’t really like the food and drink selection. The only non sweets were cheese and fruit. No coke products. So not terrible, but not my favorite. Even before COVID I found the MK dessert parties to have my least favorite selections, but now it’s worse. We book mainly for the guaranteed spot, and the desserts are just nice to have also.