I have been using Matisse acrylic mediums for a number of years and unless something dramatic happens I will continue to do so. Cost is a major factor (the suggested dilution of 1 part medium to 1 part water means that I get a 2 Lt. of actual painting medium from each litre I buy). I use an airbrush for much of my work and using the medium instead of water ensures that I have a waterproof finish. A mixture of painting medium and spreader medium allows very fine graduations and I sometime use pastels with acrylics and in this case the painting medium is used as one would use a fixative. Over all I will not change as as Matisse mediums do the job and do it well.