Atlas equipment nearly always sells at higher prices than heavier machines,even though they are not as good. This is because many amateur machinists and old people are afraid of trying to deal with weight. I recall when I got my Jet 10"X24",it was a big deal in my mind to move it into place. But,that place meant going through the living room over the carpet.
That's another reason Atlas stuff sells better: Limited shop space. 2 houses ago I had a shop space about 10'x6'. I had a lathe in there,drill press,Burke #4 milling machine,a work bench,a die filer and a bench grinder. I had a space a little over 2' wide down the middle. I did some of my very best work in that little shop. Well,I was a LOT younger!! My first mill was an Atlas horizontal. It would cut brass o.k.,but except for slitting saws you could forget it! I did not have the outboard support from the arbor to the end of the knee. That would have helped. But less than a year later I had the Burke #4,which was a real machine,if small.
Those Atlas shapers are cute little beasts! I actually had one for a time in the toolmaker's shop,given to the shop. But,I traded it off without ever using it. Is it worth the money? Probably is if you compare what imports you can get for the money. And,shapers,though outmoded by modern industry,will do certain things that a mill won't do: like cutting keyways inside of holes in gears and pulleys. If you have no other means of milling metal,I'm sure you will use it.
CHECK ALL THE GEARS and make sure none of them are stripped out as they may well be Zamak. I recall another feature that is very fuzzy in my head: The gear box that controls the sideways feed of the table. It is attached to the side of the main casting;I think earlier models had a stronger casting enclosing the gears. Later ones had a Zamak casting prone to break. Look out for that. On the shapers I have seen,the mechanism for feeding the table sideways is a WEAK point.
I would say,just from looking at the Atlas shaper I had,their shaper is a stouter machine than the horizontal mill.
Too bad you are so far away. I have a much heavier shaper I'd sell for $500.00. I have 3 mills and just don't need it. I also have the shaper attachment for a Bridgeport.