Wellity, wellity, wellity.... I'm pretty sure I've never seen a grid like this. BUS/TED APART, as it were. BRO/KEN INTWO. And the third (what I'll call) theme entry BAN/ANA SPLIT made me LOL.
I liked the fill a lot. TAXICAB (17A: Its distance is measured within a meter) is remarkably clever, I like the word IKEBANA (18A: Japanese flower-arranging art), and wish I could have remembered it without crosses, 38A: Throw on the floor (AREARUG) is another strong clue, and I enjoyed THENORM (40A: How things typically are) too. I don't know about you, but I was surprised by NEIGHED for "55A: Called from a stall, say," and was thinking more along the lines of "Any paper over there?"
I could go on and on. 21D: Subject of an old wives' tale? (HUSBAND) got an LOL, and the bonus 15 TRANSISTORRADIO (11D: It could carry a tune in the 1950s) got a smile, too. I love the word AWEIGH (39D: Out of bed, in a way?), but I'm not entirely sure I understand the clue, and MASERS (42D: Atomic clock components) I am entirely sure I don't understand.
Overall, I liked this a lot. I even smiled at TPING (32D: Pulling a prank outside a house), and the somewhat pedestrian BUS (1A: Route follower) gets a B, even though it is part of the theme. That's just the kind of good mood I'm in.