I use them with acrylic paints/inks and they work well overall. They would have been better if they had slightly thicker bristles but, you know, these were a bargain an are not intended for artwork. They make good long flat and curvy lines with ease but due to the bristles not being strong enough, sometimes the lines aren't clean. It might be me, as I'm just getting used to them. They're perfect for people with small hands and they're good quality despite the bargain price and the fact that they were intended for nail art not painting. These brushes work better on flat paper (e.g. art journal pads) or on surfaces that have none or little texture (e.g. cold pressed watercolour paper).
These brushes are easy to clean and can be kept in water for a long time without worry. The 'crystal' handle material hasn't deteriorated at all despite my tendency to forget brushes in water all night or for several days. The synthetic bristles get bent when left in water for long, but they recover their shape easily by drying them out with a paper towel and pressing them back into their flat shape with my fingers.
I haven't used these for nail art, so I cannot comment on how they work for that purpose.
