It's free 🙂 And I think it works better then the built in solution. Looks like he actually calls it Magic Solo. This might be personal preference, but I like it better since it is really simple - select your object/objects and hit the plug in. You get your objects and associated materials solo'd until you hit the button again. Simple.
"problem: [R21] slow saving of .c4d file to network share"
This was improved in R26, network saving can be >10x faster due to the new file handling code. Users report that on for example a 10gb network, saving speeds are around 500 mbyte/sec