Cadkey reading 3D+ ?

[Aton]

I am thinking of purchasing a structural design CAD software put out by CSC called 3D+ It is designed to integrate with Autocad. Trouble is, I am trained in Cadkey, and do not wish to have to purchase Autocad or learn it right now. 3D+ costs about $7000, so I do not wish to make a mistake. It DOES interface with another structural analysis program called S-Frame, which I also use, and with TEDDS, a calc pad program, so there are advantages to getting 3D+. Does anyone have experience with both Cadkey and 3D+ ? I realize this is a long shot, but thought I'd give it a try. Thanks, all. Sustainable, Solar, Environmental, and Structural Engineering: Appropriate technologies for a planet in stress.