I originally bought these for my Konad nail stamping plates because they specifically said "Nail Art" on there. Stupid me, it's called Nail Art because the brushes were particularly thinner so that you can draw with more accuracy. The ones I got were glittery too, which did not work well with stamping since the glitter would get stuck in the plates. So don't make the same mistakes I have. It took me a long time to get rid of the glitter that was stuck in there.
So now, I actually save these for "nail art". I'm not very good with drawing on my nails (especially with my left hand) and the tip of the brush seems to be too thin to apply a full coat on my entire nail. So... I save them for the finishing touches! For example, I don't like putting rhinestones on my fingernails because I tend to pick on them until they fall off, which typically doesn't make the nails look very nice when they do. So what I do is that I use these "nail art" nail polish to dab a small dot of glitter on there to make it shine. It works quite well since the tip of the brush is so thin. This way, it has the same effects as the rhinestones, it's cheaper, and I don't have to waste them!
Here is an example of me using it similar to rhinestones.
(Yes, I'm reusing this picture - hehe)
I think they're pretty good and would recommend them. They make good small decorations and finishing touches on your nails if you use Konad stamping, but I personally don't find the need to stock up on it. I'll buy again if I run out though :)