Really like this set up for watercolour brushes and would work well with acrylic but not for oils, it is too small for oils.  But you need to be careful with watercolour brushes because they are very delicate so do not drag them across the bottom.  Also, a nice size for on the desk or even for working outdoors, which I do not do but I know a lot of artists do like to work in nature.  Different size holes for different size brushes but make sure not to let them stand up like that for too long as the water will erode the area around the metal where the brushes meet the wood.