>1. Who uses and enjoys them?
I have a few and enjoy them.
>2. Feeding - what types of feeders?
Anything that works on a Langstroth. I've used frame feeders, miller feeders etc.
>3. Supering?
I have, but it kind of defeats the purpose...
>4. Division boards?
Don't have any.
>5. Screened bottom boards or solid?
I have done both. I will make any new ones solid out of either that coroplast (there is an election coming up...) or 1/4" luan. I've used both before with good luck.
>6. Length of hive?
Mine are 48 3/4" so three migratory covers fit for a lid... which is about 33 frames.
>7. Top cover - one piece or sectional?
Mine are sectional. But it wouldn't hurt to have one piece the fits over the sections... I'd rather not have it all one piece with ever gap between every frame exposed every time you take off the lid.
http://www.bushfarms.com/beeshorizontalhives.htm