Pretty good!
"I was interested in glass fiber PCTG as a more rigid, durable around-the-house filament for functional parts. The filament delivers - it stands up to the demands quite well. I selected natural because it was the closest to white, but the appearance is milky and vaguely translucent. It's fine for what I needed it for, but would prefer a pigmented white filament in the future. Printability was a little tougher than Pro PCTG, and there wasn't an exact profile provided at the time, but I was able to adapt from the ones that existed and get pretty good results. You do pay a little bit of a premium for a smaller, American made brand. I didn't mind that so much for a one-off, but I would hesitate to add it to my regular rotation. There are some really high end engineering filaments that I use regularly, and today the cost difference is significant."