Maybe this is why I had a somewhat different impression: David set it up as more of an overall pickup for a singer and an acoustic guitar player- 2 or 3 feet back from the players in a mid-sized iso booth.
I was expecting it to be big & round and leaning toward dark (because of the lack of resonance in the capsule design), but the top end was quite present in a nice, pleasing, 'record-like' way, and not like the [darker] type of U47 examples I tend to gravitate towards.
To my ear, the top end balance sort of split the difference between neutral and a 250/251 (but with a different top end flavor than a brass CK12)--at least in the context of that particular situation.
BTW, David pronounced it "Five Oh Seven" at the seminar where I heard it.