Untimed, completed with my mother and Cece in NYC.
Apologies for the delayed post today, but it was a busy day yesterday. We got into NYC at 9:25 PM, completed the puzzle by 10:30, and then off to bed.
I was concerned when I saw the grid: three stacks of three 15-letter answers. And we all know my particular aversion to stacks. I am always disappointed in the short fill necessary to make the stacks work. In addition, the 15-letter answers themselves are typically hit or miss.
Well, I was pleasantly surprised by today's puzzle. Let's take the 15-letter answers first. The first one we were able to get was ONEAFTERANOTHER, and I can thank my mother for that one, because when I asked "What does 'seriatim' mean?", she immediately answered "one after the other." As is typical in a stack puzzle, once you get one of the answers, the others come pretty quickly. Both GETSTOFIRSTBASE and ISTHISSEATTAKEN are very acceptable phrases.
A typical feature of these stack puzzles is that they tend to split up into mini-puzzles, and that is true here as well. Once you solve a section, you have to start essentially anew on the next one. We moved upwards to the middle section, where ORANGEPOPSICLES was the first to fall. That's a thing, I suppose, but not any more of a thing than grape or cherry popsicles, but whatever. TURNEDTHETABLES works well, although I don't think that the clue actually defines it well enough. Yes, if the picked on person goes to picking on the person who bullied them, that's turning the tables, but I initially took it to mean graduating from the hazed to the hazer, which has a much less acceptable tone. ATTENTIONPLEASE is a fine answer.
The top section has JUMPINJACKFLASH, which I ought to have gotten from the clue, but which needed a lot of crosses to figure out. AHOOSIERHOLIDAY is the only 15-letter answer I had no clue about, while NOCAUSEFORALARM is great. So to summarize, out of 9 15-letter answers, 7 are high quality, 1 is high-medium quality, and 1 is medium quality, but only because I'd never heard of it. That's good work.
The crosses are for the most part also very high quality. I don't like the two "genus" clues (bluegrass, POA; Virginia willow, ITEA). There are a couple of partials, like IAL and ENES, and your typical abbreviations, such as SHAK, EDT, ADAS, and TBA. There's also EFS, which I find questionable. But there's also some fine cluing. 5D: Trooper, e.g., didn't become clear for a very long time (ISUZU). 15D: Service lines? (HYMN) is very good. 28D: Ally in a partnership (MCBEAL) is a nice hidden capital, even if quite dated at this point. 53D: Start of treason? (LESE) is pretty erudite.
On the whole, I was very pleased with this puzzle, and gratified at the point of completion.