I've been very tempted to try a TBH, but my only apiary until this year has been on an allotment and the thought of trying to cart it away in the event of problems has been enough to dissaude me. I'm experimenting with, at this point, a single Super frame with no foundation, I left a starter rim of a couple of cells worth of comb around the edges and I'm interested to see how the bees deal with it, I'm intending to stick it between two pre-drawn combs and see what happens. What might be more useful/interesting is how they deal with a 14x12 frame with no foundation in it.