I decided to purchase the Stippling brush after seeing it featured on many blogs and Youtube videos. The brush is a perfect all rounder, and can be used with liquid foundations, powder foundations, cream blushers, highlighters and setting powders.
So far I've just used it for liquid foundation and a setting powder. I found that my foundation went much further so I used less foundation and got the same coverage. It blended in so well, and looked flawless and natural, but still allowing me to have good coverage. I love it so much, it has taken over my old holy grail foundation brush from Sigma. I prefer to use a larger brush for powder, but it still provided good coverage.
I couldn't recommend the collection more, I'll definitely be getting more than one next time! The Real Techniques brushes are available in Boots.