"is PDM works worth using for only 2 people? "
If you use parts in multiple assemblies PDMWorks is probably worth it. PDMW will keep track of all the links and when you need to update the part it will tell you every assembly where the part is used so you can check for compatibility of the the...
We went from Cadkey to SW and found no reasonable way to automate translating files. Most of our drawings were done in layout mode so all SW saw was some lines and no model.
To move the model to SW I copy the CK file to my working directory, open the file, delete any solids that are not needed...