I have a couple of the old Atlas ones
Biggest disadvantage is the short length, 9 inches which is 62 scale feet. That works for most older diesels and some steam engines such as Model Power old-timers and old Bachmann Prairie/Consolidation/10-wheeler. Not suitable for newer steam and diesel engines, but many folks have used the mechanism at the bottom of the turntable pit to drive larger bridges. Advantage is low price and good indexing.
Very.
I think it was Germany, perhaps not now.>
It has a built in "Geneva drive" with nylon gearing that has realistic speed with their motorizing kit. Old ones indexed to 12 positions, newer ones perhaps 24.
Jeff Cornelius