We euthanized twenty eight colonies last year on advice from the SBI, they were totally unmanageable.
Two days after they arrived a worker took seventeen stings while opening the field gate 500 yards from them, and it just got worse from that point on.
Tractor driver in adjacent field stopped for a break and they filled the cab, the machine had to be abandoned until the next morning.
Originally thirty arrived, tried to re-queen Two, but they were really dark and wouldn't accept anything we have, which then left only one option unfortunately.
Two big lessons learnt, never buy bees unless checked over by an inspector first, and don't mess about with fiesty colonies, destruction is better than being sued.