I already reviewed the Mac 217 brush here. I don't like using the Mac 217 for crease work or for blending out harsh lines. However, it is my go-to brush for applying transition color underneath my highlight color and above my crease area. That being said, I bought the Coastal Scents Pro Blending Fluff brush and the Sigma E25 brush with the intention of using them the same way that I use my Mac 217 brush.
The bristles of the Coastal Scents Pro Blending Fluff brush are the same size as the Mac 217. The only difference is that the Coastal Scents version is less dense, and a little bit flimsier than the Mac brush. I prefer the Coastal Scents brush for adding transition color and for crease work because it's easier to control since the tip of the brush is not as wide as the Mac brush.
As for blending, I didn't like the Mac 217 for blending. So, I knew I wasn't going to like the Coastal Scents brush for blending either. Both of them are just not firm enough for blending out harsh lines. However, I do prefer the Mac 217 for blending out light colors, such as transition colors, since the tip of the brush is wider than the Coastal Scents brush.
The bristles on the Sigma E25 brush are wider, flimsier and not as dense as the Mac 217. I don't like the Sigma E25 for adding my transition color or for crease work because it's so hard to control. My eye makeup messes up easily if I don't be careful because the brush is too big for my crease area. I would only recommend the Sigma brush if you found the Mac 217 to be too small, which would really surprise me. I use the Sigma E25 mainly for blending out light colors. However, it does not blend out dark harsh lines because the brush is too flimsy like the other two brushes.
I also found that all three of the brushes do not pack color onto my lids that well. They only add a light wash of color onto my lids.
Bottom Line: If you want a great alternative to the Mac 217 brush, which costs $22.50, then get the Coastal Scents Pro Blending Fluff brush. It is $3.95 and cheaper than the Sigma E25 brush, which is $9.
Note: The Mac 217 measures 6.5 inches. The Coastal Scents Pro Blending Fluff brush is 6.7 inches. The Sigma E25 is 7 inches.
In response to the comments below: I don't like the Mac 217, Sigma E25 or Coastal Scents' version for blending HARSH lines because they are too flimsy. I only like to use them to add my transition color and then use it to blend the transition color. I only like to use them for blending out LIGHT colors.
I have a heavy hand; therefore, I usually add too much color to my eyes. The only brush that can blend out HARSH lines is my Sonia Kashuk Large Crease brush (my holy grail blending brush). Click here to read my review.
I have a heavy hand; therefore, I usually add too much color to my eyes. The only brush that can blend out HARSH lines is my Sonia Kashuk Large Crease brush (my holy grail blending brush). Click here to read my review.