Well
I found this filament useful to keep my nozzle clean and avoid untimely clogs when changing filaments. That said, there's nothing magical about it either: when I switched from PLA to ABS, I still had some PLA residue that remained, burnt out and ended up clogging my nozzle. Its biggest use to me is when changing nozzles (from 0.3 to 0.4 for example): I pass 10cm of filament before changing, so that all my nozzles contain the same plastic residue which is easy to remove when I re-use them, as it is not too sensitive to overheating.