Wingspan-wise, certainly no "tiddler" - even today.
That enhanced wingspan allowed the aircraft to deliver the weapon from 40,000 feet...and 50,000 feet with the 'featherweight' models.
Slow?
Yes, except over the target, and retreat (which was 410 knots TAS).
A high flyer?
Absolutely.
When one flew overhead (and I personally saw many in southern California at the time), the sound was unmistakable.
Not engine noise, propellor beat.
It would rattle windows for at least two minutes.
Three aircraft together (often seen)...the ground shook for three minutes.