Hands down amazing! ? This brush has improved my eyeshadow application in ways I never realized were possible!  It's like having 2 flat shaders and 2 fluffy crease brushes stacked together in one awesome tool.  The size & shape of this brush head fits into the orbital socket perfectly, even with my hooded eyes.  The double domed head allows me to apply 2 different colors at the same time & blend them together for the quickest ombrè ever!  There IS a slight learning curve on how to use this to it's maximum potential. (To load each brush head with separate shadows, you have to flip the brush).  Once you get the hang of it, this brush is a lot of fun to use!I also got the Golden Triangle version of this brush.  I didn't realize it at the time, but they are the exact same double domed brush (#729).  The ONLY difference is the handle (and a few dollars difference in price).  This brush ($12.00) is from Bdellium Studio line, and has a round wooden handle in yellow.  The Golden Triangle series brush has a triangular shaped wooden handle in blue.  The ferrules are different colors on each brush, but they're both square ferrules, which keeps them from rolling off your vanity - a feature I've come to appreciate!  Everything about this brush is top notch. ?I actually prefer this brush over the Golden Triangle version.   The round handle of this brush is just more comfortable for me to hold.  Both brushes have a nice weight & perfect balance to them.  Whichever one you chose should be based on your handle preference.  The double domed brush head is what makes this brush design special, and I wholeheartedly recommend it!  Bdellium Tools is definitely professional quality & their brushes are built to last. If you love playing with eyeshadow, you should definitely own one of these brushes. ❤