a study was just posted in bee-l. if the link doesn't work it means I forgot to log off first.Anybody got anything new here ? I have only have experiences with 2 queens 2018 and 2020 . I find them very " Russiany" . Very small bees that shut down at the least indication of a dearth and still need treated. The NWC pure stock and the NWC X's with Italian's do much better at my place .