Apparently the slide out tray keeps things tidy, and can be completely disassembled, its floor is removable strips. I have overwintered my hives in a crude bb this year and it seems to be good so far. I did a stores check the other day and lifted the back of my hives up to get an idea of weight and saw no dead bees on the bottom. Cleaning solid bb last spring was gross, the amount of dead bees and debris was amazing. I think if the entrance can stay open then it should help bees to bring out the dead. I have two tiny 8mm entrances on now and they seem to really drag out the dead on warm days. The trays on these new bb should be better than what I have now. I guess time will tell.
My thinking was that with a screened bottom I could take out the trash regularly enough myself? I know your not supposed to bother bees during winter but every couple of weeks a two a trash dump should be ok??