I have one hive that is Carnolians which seem to be as gentile as 3 of my hives of Italian, but the 4th hive of Italian are some nasty mean devils. Of course I do think I have 5 hives of mixed breeds with 3 having Italian traits and one with Carnolian trates then that one that has the traits of AHB's
I read about the so called Russians being resistante at $100.00 a pop.
Then you go on to read the real paper work on them and find you have to do requeening every year for about 5 years to get the resistance ones.
Me I would just go with the Italians for a few more years. After all we have been dealing with the mites for some time now what is a couple more years to see if it is just hype or the real McCoy.