We did the dessert party on Aug. 27. It was a spectro night, and I would recommend you don't go on a Spectro night if you want to see Spectro. Seating time is generally during the parade. You can kind of see it from a distance at the party site, which may be fine for you if you've seen it multiple times, but the parade viewing is not great for first time parade viewers.
Viewing of Wishes was very good, I thought. Be prepared to get up and walk to the railing to view it. (They won't let you move your chairs.) But it wasn't as if we had to claim a rail spot early- just wandered over from our table a couple minutes befor the fireworks.
Tink did not fly for us

Maybe due to weather, I don't know. Dissapointing, but it can happen, as you are really just paying for dessert, not entertainment. If Tink's safety was in question, I certainly wouldn't want it comprimised. Still, it would have really made it more worth the price to see her fly right over.
The desserts were very good, and though they were grabbed quickly (and in large quantities) by guests, I thought CM's did a nice job of replacing them as soon as humanly possible. We had plenty to eat, and we were not among the first to get to the buffet.
It was a good thing to try once, don't know if we'd do it again now that the price has increased. Maybe.