I use them with my BM foundations and blush and I love them! They are smaller than my previous brushes and I was a bit worried they may be difficult to use but they are amazing. The softest brushes I ever had. They feel very thick and I was so excited about doing makeup for weeks cos it feels amazing on my skin. Washed them recently and they still feel amazing. I use no 4 and 5 for mineral foundation and blush\bronzer but not a fun of the 3rd one it feels a bit plasticky and doesn't aplly mineral foundation well. I think its said to to use it for liquid foundation but i think its way too small I'll take you forever unless u need it small for travelling etc.overall though I love them! Once mine are on their last legs I'm definitely ordering some more.