Stacking 11-letter answers is a tough task — there are so many crossings that must work out, and too often that results in some ugly piece of glue. Barry gives us one of the best stacked 11s from recent memory, with RADIO GALAXY (I used to love astronomy), ABRACADABRA, and ICE CUBE TRAY, with such clean crossings. Some might think YAYS is a bit iffy, but I tend to let pluralized sounds slide when it's common to hear them in multiples. I can imagine a crowd letting out a bunch of YAYS, yeah?

Okay, some might question OCULARS (a fancy term for "eyepiece"), but OCULARS are a big product for Olympus, which invested in my previous company (Acucela Inc.) so it's fine by me.
Loved USS NAUTILUS too, as it evoked images of Captain Nemo's ship, the Nautilus. Barry does pretty well with all his long slots, even PLEISTOCENE an interesting word, and PARAPHRASES getting a great clue in [Shortens a sentence, say]. I tried to stretch out PARDON in so many ways — dang it!
Interesting clue for MIL, a common measurement in mechanical engineering equal to a thousandth of an inch. A MICRON is a millionth of a meter. Too much engineering-speak? Not for me, but I can understand how some might grouse, especially when you toss in JOULE.
When a puzzle doesn't have a huge number of long assets (I count maybe 10-11 here), it's important to me to keep the gluey bits down. Otherwise, they tend to overwhelm the assets during my solve. -THON is a suffix, ENS and AUTH are abbreviations, LAC a bit of French, JAS is an abbreviation for … James? There's nothing egregious here, but overall, it's enough to make me notice. I wouldn't mind as much if there were, say, 15 great entries, which would stomp down those pesky gluey bits.
Great clue in [it may be written in stone], a quite literal interpretation for RUNE. I also appreciated the modern clue for TESLA, [They charge a lot for their cars]. It's not quite there yet, as TESLA charging stations are nowhere close to ubiquitous, but I really liked the idea behind that clue.