Just thought I'd share that I've finally made time to transfer one of my projects from Wyg to Capture (Nexum) and it has gone pretty well considering I'm still very green in terms of understanding Captures tools and methods.
I exported my Wyg model as a dwg and imported it directly into Capture which mostly worked apart from several items which were open ended lines in Wyg which had their ends joined during the import process.
Next I tried importing the dwg into sketchup pro first and then imported that version into Capture, which was pretty close to perfect. (Apart from no textures or colours surviving the dwg export)
I'm also a novice with Sketchup yet it was fairly easy to re-texture items with it and from there all textures and colours import just fine into Capture. Once all that was done, the model in Capture looked pretty similar to the Wyg version.
I'm pleased to report that I'm extremely impressed with the image quality of the visualiser, it is certainly better than my (now quite old) copy of Wyg.
Now I just need to learn how to use everything properly...