Being in the beauty industry for 10 years means that I have seen a lot. A lot of good and a lot of, well, unnecessary. Until recently, I put foundation brushes in the "unnecessary" column. I mean, yes, for makeup artists they made sense- not wanting to touch faces, mixing product by hand, sanitary reasons, and just the fact that they are makeup artists and the assumption is (by me, at least) that they have superpowers which sometimes require tools that mere morals wouldn't know how to use correctly anyway.
I few months ago, I was introduced to the Shiseido Foundation Brush. So I decided to try it out. And subsequently kicked myself for not doing so sooner.
With this in hand, I use about 50% less liquid foundation (I switch between Make Up For Ever HD Foundation in Shade 118 and Dr. Jart BB Cream these days) and get 100% better coverage. Blending is seamless- the brush somehow picks up the perfect amount of product each time, and the angled slant of the bristles makes covering up those spots which always seem so be a little red (like the corners and center of the nose and the middle of the chin) effortless.
The brush is $30 and will pay for itself in no time. (By the way, in addition to excess product saved, I am including a penny for each compliment you will get on your skin as part of the cost equation.)