I'm not a big fan of the very shiny black surface that I see with most black PETG filaments. But I needed black PETG for the phone holder I was making for my 350Z. PLA will melt in a hot car. I wanted a matte or semi-matte PETG. I found two, but this one was less expensive and easier to get since the other was from the U.K. My first results were mixed, but after changing my worn nozzle and ensuring that my filament is dry, this matte black prints great. I get little or no stringing once if the filament is dry. If not, it will string.
I wish it were actually a bit less matte than it is. It would be nice to see a semi-matte version. But as it is, this matte finish makes the phone holder seem more at home with a car interior. The experimental "fuzzy" option in Cura helps by hiding the layer lines and the underlying polygons in the model.
I only give this 4 stars because I think the ease of printing is oversold by California Filament. Plain and simple, PLA is easier to print. But this PETG isn't exactly hard ... if your filament is dry and your nozzle is in good shape.