There are two species with the nickname banana spider. This one here is the golden orb web spider. Mildly toxic. About like a bee sting and doesn't rot flesh. And it's really docile, they'll walk all over you arm and hand and not bite.
The other one nicknamed "banana spider", that you're thinking of is the Brazilian wandering spider that has shown up in shipments of bananas. Now that dude is one of the most poisonous in the world and very aggressive.
Thanks for clearing that up Joe, I heard that poisonous one is a bad mofo! Right up there with the Sydney Funnel Web spider....unlike most species the male is 6 times more deadly but the female looks the scariest and is bigger.