I recently purchased these inks from Aboveground (awesome staff and customer service), one of my favourite stores in Toronto that sell art supplies . These inks are acrylic-based, pigmented, water-resistant, and non-clogging. Acrylic-based inks are normally not advisable for use on fountain pens, but I heard people using these in their fountain pens without any problem. But because they're acrylic-based and pigmented, I would advise you to wash/clean your pens between inking and also not to leave the inks in your pens too long when not in use.
I inked my Jinhao and Lamy fountain pens with each colour and am amazed how well these inks behave in my pens. They flow very well. I'm even more amazed at how vibrant and beautiful the colours are when laid on paper. I made a sketch of each bottle below on Stillman & Birn Alpha sketchbook. There is no bleeding or feathering whatsoever.
I am very happy with these inks...all 6 of them! I only wish there were more colours offered. I may actually experiment by mixing them with each other.