They're pretty cheap pens compared to kuretake, tombow and pentel, but they still work okay. The annoying thing is the pens leak water uncontrollably despite having a black plug between the reservoir and brush. But these are really good starter aqua brush pens if you want to practice!
One of the brushes has uncontrollable water flow when painting, another has poor build quality.
Product is great, they do the job just fine
I honestly really love having these. While the water does come out a little more than I'd like sometimes I still think they're great. Don't know why it took me so long to get one of these.