I have heard from a few other TX beeks that the MN Hygenics don't like the hotter-than-heck weather we get here in the South in the summer, although I have not used them myself.
I use R and B Weavers and like them both. Also like the Rossman bees. In three years, the weather has been as much or more an issue than the sorts of bees. Dry, dry, dry!
GL
Summer