Not as good as an upright slalom fin Surfnfreak, but the ~ 30 degree Tribal fin is feels better upwind than a regular 45 weedie
I tested a 33 Tribal weed speed back to back against a 38 cm C3 Sting. Patrik 100 slalom, 7.0 NCX. Not fully powered up so neither the 2 upwind angles are brilliant. The upwind angles are about the same though. The C3 felt crisper upwind. Might have been more wind @nd run so can't be sure about speed.
And of course I had the upright C3 fin in when I hit the shark. I can verify that the Patrik boards have very strong fin boxes, it was an instant full stop catapault against a big solid shark. Minor damage, a stiff neck, a bent front fin bolt, a small crease in the nose. Didn't get to see how the shark fared he'd pissed off.