Go get it. Run. Don't walk.
If I remember correctly, Vigorelli was an engineer who had worked for Necchi before starting his own company, and the Vigorelli Robot was the first domestic machine manufactured with a built-in camstack for decorative stitches. It posed a problem for Singer's 401 due to patent infringement issues and there were a series of negotiations between Singer, Vigorelli and Bernina. I always think about it as The Zigzag Wars, but I suppose it's actually more like The Decorative Stitch Wars. Here's a long court document about it:
http://ny.findacase.com/research/wfr...028.SNY.htm/qx
Here's a comparison picture of the decorative stitches of the Robot vs. the 401:
http://needlebar.org/cm/displayimage..._display_media
I don't have a Robot, but do have a later model Nelco-badged Vigorelli Amica Super Practical. It's a very strong stitcher, makes very nice decorative stitches and is surprisingly fast. It does take odd bobbins which are about the size of Pfaff bobbins but have holes on one side like Elna bobbins. Apparently, they're hard to obtain, but mine came with 18 so that's enough for me.
There is a yahoo group called borlettivigorelli and they do have a manual for the Robot in their files.
I have a special fondness for the German and Italian machines.
Good luck.
Run.