Thanks to all who answered.

Michael, the first link you gave shows exactly the problems I have had with exports from CAD programs to OBJ format. In fact the products I am trying to get models for are very similar to the ones shown in the first link. Round items with holes in them. The areas around the holes never come out correctly no matter how I have tried. I love the results that MoI gives in comparison to the Rhino output. I am sold on MoI and as soon as I get the money it is going to be my first investment. I can deal with the TurboCAD Pro I have now for a little longer if I can get meshes that clean from MoI. There is no comparison. Thank you.