It's strange: I've got the Super Compact (half of a ST), and I find the dispersion excellent, compared to other cabs or combo from other brands.
When I play in a rented rehearsal studio, sometimes I bring my BF SC, sometimes I don't and I just use whatever is provided: Markbass, Fender Rumble, Ampeg or Hartke amps. I find the dispersion of the SC much better, and I must say it often motivates me to bring my cab from home just for a 3 hours rehearsal (the other main motivation being the better sound quality, obviously).
I've never played a Genzler Bass Array so I don't know, maybe its off-axis dispersion is even better, but I would certainly not say the BF is lacking in that regard.
Other SC or ST owners: do you think the off-axis dispersion is good, average or poor?