danno,
This is our 5th year for Russians. We heard about the aggressiveness of the Russians before we started, but liked the idea of their mite resistance. My wife always says we'd survived raising teenagers, so figured we could handle the Russians. :-D (BTW, the Russians are easier.) :-D
Started with 2 nucs from Arnold Honeybee Service in Knoxville, Ky. Got a few more nucs and a few queens from Jester in West Ridge, Ark. Got a Russian breeder queen from Glenn Apiaries in Fallbrook, CA. last year. Went from 6 wintered the 1st year to wintering 39 last winter. We've had nothing but Russians so can't tell you from personal experience about the others, but most everyone around here has the others and we seem to have no more or even less trouble 'behavior wise' than they do, according to the way I hear them talk. Will only occasionally need to wear a veil or use smoke and have worked them often under less than the best conditions. Haven't used any medication other then wintergreen oil grease patties the first year and a few patties the second. Had 100% survival rate until last winter when we lost some, mostly nucs I tried to bring through a crappy winter. Have only had one hive I replaced the queen in because it was hot and believe they were not happy cause their queen appeared to be failing and needed replaced anyway.
I could go on, but you probably get the idea. :) We have not been given a reason to this point of considering any other bee. If you have anything near the experience we have had with them I'm sure you will feel the same.
Search for 'acbs' on this site for a few of our posts about Russians.
Hope this helps,
Arvin