They are fab as an alternative to the National and a much cheaper (and better, IMO) option to a plastic beehaus (I have both, and run mainly 14 x 12 Nationals), which is the modern derivative.
You could ask Robin Dartington (buzzworker) on this forum, if he tunes in regularly enough (but checked him out and he was last here about 6 weeks ago).
As MM says, they are not particularly portable! They have some plusses and some down-sides - like all hives. They never caught on as a viable alternative, so never really took off in numbers, so as to speak; more a niche market. So I would think the beehaus will eventually go the same way - apart from the 'plastic everything' fanatics (not including polyhives in that!)
Top bee space, 14 x 12 (but there are several variants), half supers (I rarely use them on the hive apart from supporting the roof - National supers are easier for me), superb for overwintering, but limited regarding moving frames within the hive (fixed brood box, so unable to move brood boxes vertically). Easy to make, if straight and square cuts can be made, but a lot of pieces. I have two and both are in use (except I am relocating one of them at the present time and it's easier when empty).
I like them as a 'complement' to my Nationals.
Regards, RAB