I have several Sigma brushes. Eyes E25 (similar to MAC 217) ~ It's not bad if you're just starting out in makeup, but I recently upgraded to the 217, and personally, I prefer the MAC. The bristles are shorter and stiffer, and it fits my eye better. E30 (similar to MAC 219) ~ I don't reach for it very much. I tend to prefer an angle brush to apply eyeshadow to my lower lashline (my angle brush is from EcoTools). E45 (similar to MAC 226 (limited edition)) ~ I like this one but haven't used it much recently. E55 (similar to MAC 239) ~ The one I have has a few short, stubby hairs that poke me sometimes, but that may not happen to you, should you decide to buy it. I have a similar one from e.l.f.'s Studio Line; while it doesn't poke me, I think the e.l.f. one is a bit thick for packing on colour. I'll soon be ordering a flat shader by Roque Cozzette to try out. Face F40 (similar to MAC 168) ~ I prefer to use this for blush than for contouring. The bristles aren't very dense, and -- for my face -- it's too big for contouring. F60 (similar to MAC 190) ~ I think it's a smidge thick and doesn't work as well with some of the foundations I have, not to mention I'll need to replace it soon because the ferrule is loosening. (Be careful when cleaning this sort of brush!) F80 (similar to MAC 130) ~ My favourite of all the ones I own. I love it for stippling foundation on; it gives a near-airbrush finish. I also want to get, at the very least, the F05 (109 equivalent) and the F50 (187 equivalent).