A roller-coaster ride today, full of ups and downs:

UP: COLD CUT, BINDER CLIP, WINDOW TRIM … how could these possibly be related? Ooh, I'm going to get a strong a-ha!
DOWN: BARBERSHOP. Synonyms for haircut. Huh. It works, but it's not exciting.
UP: That's unfair. Alex did a great job of concealing the synonyms' meanings. The CLIP in BINDER CLIP has nothing to do with cutting. Same with TRIM in WINDOW TRIM. I did admit defeat at "Name That Theme," after all.
UP!: BARBERSHOP … QUARTET! Ah, a quartet of "cut" synonyms … WAIT! Each one has EXACTLY FOUR LETTERS! Okay, that's much stronger than I thought, approaching POW! consideration for taking a tried-and-true theme to new places … hey … wait.
DOWN: Math is hard.
Many solvers would miss the heavenly elegance of four BARBERSHOP words, every one with precisely four letters. (Some will probably miss the QUARTET part today, even.) I would have loved if the theme had gone that extra mile, though. Maybe BRAINWASH, to start the haircut? That would have gone away from straight-up synonyms, but I enjoy it when a crossword tells a story — kicking things off with a WASH, going to a HONEYCOMB, to a CLIP, to a TRIM?
It's hard for us bald guys to tell a good BARBERSHOP story.
I appreciated all the bonuses, HALLE BERRY and IN MEMORIAM excellent, and SIX PACK, MOLIERE, NEWBORN, too. Not so much the compromises, EGON EPHOCAL SMEE — a trio newbs shouldn't have to wade through. Along with the crosses Alex mentioned, HEEHAW crossing WKRP might turn off younger solvers, who could justifiably guess a wide range of letters for HEEHA? / ?KRP or a few other things, too.
It's hard to avoid this kind of crossword glue when working with six themers. I'm curious if crossing BARBERSHOP with QUARTET might have helped (having no symmetrical themer to QUARTET). You'd have to rejigger every other themer, but it might have been worth it.
I like when constructors try to add an extra layer into a standard theme type. There were too many hitches today, but I'd much rather have this than simply four circled synonyms.