There’s a lot of discussion on the Exploder about the config.pro option:
intf_in_use_template_models yes
Old hat says:
If you just want a one click import, fine.
Experience says you should probably do some setup and editing before using import geometry. Things like checking the accuracy and creating a meaningful geometry frame. Sometimes I re-export the data according to the new coordinate system.
Accuracy:
Old FAQ info (IGES Accuracy)
Possible clues at Delcam Support Forums (STEP Accuracy)
Don’t know if this info is that valuable – you decide: