I have the J5523, J142, J004, G5520 and G5521, the J5523 and its a great brush, same shape as mac 217 (i have both) but like 10 times softer, so you can place color on the lid, on the crease, blend and it does a good job without feeling scratchy on the skin, i also have the J142 and i use it to place transition colors on the crease, its somewhat firm but soft so it doesnt leave harsh lines, i use the G5520 to put highlighter on the inner corners on my eyes, the J004 is a little taller and more flat than the mac 239 and i use this one to place shadow on my brow bone and to pack on colors on the lid and works just fine, and i use the G5521 to set my undereye concealer with powder, i love this brush. Im not planning on getting any more hakus atm because now i wanna try some chikuhodo