I have used Amitraz off label and on label for a couple of years now.  I do
not see any disadvantage if use with care.

My drones giving colonies are treated well in advance and then not touch for
the period I need the drones.

All nucleos colonies are treated after the queen had mated.

It degrades quickly so there is not much chance for it to taint the honey.

-- 
Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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