B Weaver or R Weaver? they are different - as I understand it they are cousins but otherwise nothing to do with each other.
I have queens from both. I have had good luck with the non buckfast line from R Weaver, very productive and after several years of letting them supercede they are still not overly agressive.
I bought 5 packages from R Weaver last year no problems.
The SMR line from B Weaver - I purchased 5 queens for splits One absconded but the other four did quite nicely in Nucs. I haven't tested them for Varroa yet since first year is pretty much irrelevant anyway. This year will be the real test. They are easy to work.
Both companies have been good to work with but B Weaver is more expensive. If not for the SMR I would go ahead and buy from R Weaver for the price difference.
Productivity was hard to measure here since we had 2 years of drought.
"Beware of all enterprises that require new clothes"
Henry David Thoreau, Walden