I finally bit the bullet and started a TBH this year. It had a rocky start, the package installed in it 2 1/2 weeks ago bolted after a week, apparently when the comb they had built fell off the top bar. Installed a second package and they are building comb like crazy, had to expand the nest by 3 bars after a week. Beautiful white, heart shape combs. I hadn't appreciated how awesome it is to look down a growing nest in a TBH. Wish now I'd trusted my carpentry and built this as an observation hive. Still, can't complain, the girls seem happy and the colony is expanding at an amazing (for me) speed. Can see why some of us become addicted to the TBH.