Archicad are yet to support improvements to IFC4 (that I know of anyway) and because it doesn't have nurbs you can produce files that won't work. But there are quite a few users that are finding the workflow working for them. If you observe problems, let me know and I'll try to advise.
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Hi John,
Have you seen you can filter the blog on topics such as Archicad?
http://geometrygym.blogspot.com/search/label/Archicad
Archicad are yet to support improvements to IFC4 (that I know of anyway) and because it doesn't have nurbs you can produce files that won't work. But there are quite a few users that are finding the workflow working for them. If you observe problems, let me know and I'll try to advise.