Often, themelesses featuring a lot of 15-letter entries don't have a lot else to talk about. I like Andrew's innovative layout, spacing out his 15-letter entries so the rest of his grid can breathe and shine. He weaves in an impressive 12 long entries — so hard to do when some of them are grid-spanners.

I loved QWERTY KEYBOARDS and its clue. That QWE* start is so odd, and what a great misdirect, referring to "power output." This still confused me even after I got the answer. I finally realized the clue meant that the top of the keyboard — the top line — could be used exclusively when typing the words "power output." Clever!
BRITISH INVASION was nice too. Oldie but a goodie. DESI ARNAZ too. And the pairing of DRIVE TIME and MASERATIS was fun. I like it when a themeless constructor can generate associations between adjacent or crossing answers.
Not as much a fan of EXERCISE SCIENCE and EDITORIAL WRITER. Both are legit, but neither sing to me. Interesting terms to look up, but I doubt either will stick in my memory, not like QWERTY KEYBOARDS. In themelesses featuring 15-letter answers, I want those feature entries to shine. The north half of the puzzle, that was the case, to full effect. The south, not so much.
A notable aspect of Andrew's puzzle is how smooth it is — this usually isn't the case for themelesses featuring uber-long entries. The grid is constrained all over the place, with those 15s and 10s and 9s interlocking, creating so much rigidity and inflexibility. But Andrew scoots by with just an outdated QWEST (now CenturyLink) and Sydney OMARR, plural RENES, RAH.
Well, there are the oddballs: OSIER, KITER, NATAL. Hmm. Each is reasonably fine on its own, but as a group, they didn't leave me with a great impression.
Some of that overall smoothness of fill may have come at the expense of snazzy entries. I wonder if EXERCISE SCIENCE and/or EDITORIAL WRITER could have been replaced with snappier entries if Andrew had allowed a little more crossword glue. Ah, the eternal trade-off.
Yay for the Q in LGBTQ! I had been wondering when it'd finally make its debut (past just LGBT).