I built a top bar bee hive last week and transferred a wild hive into it yesterday. The hive was from a neighbors bird house, he is allergic to bee stings and wanted to remove or kill the bees, I volunteered to take it. Before I was done with the bee box they split a swarm off before I could catch them, but the main group is doing fine in their new home. I think this hive design will help in the control of the mite problems bees seem to get, this hive has an open bottom with screen over it and will allow the mites to drop out of the hive instead of accumulating in the bottom.
The "v" shaped sides allow the colony to build their heart shaped combs naturally rather than a man-made shape as in the traditional boxy Langstroth hives.