I would agree with this. They're longer, larger, and definitely more active than BPs. While the BPs stay in their hideboxes, the Angolans come out to see what's going on. They're surprisingly visual and like to look around.
I have a the male in a tall CB 80 tub in an otherwise V-70 rack. The V-70 tub was entirely too low for all his crawling. I think I moved him to the taller tub when he was ~1.5 years old. He's the next snake in line to be moved up to a proper cage.
The female is in a 3'x2'x14" cage for now. She would definitely benefit from another foot of floor space.
Totally worth it, though.