When I last made an MUA order I just through these two brushes in on a whim. To be honest I didn't need them but I knew that I really wanted to try them. I'd never seen them in a Superdrug so I was a bit dubious about the quality, however I needn't have worried.
These two brushes have flown up my list of favourite brushes very quickly, apart from the good ol' Real Techniques of course. I love using the E3 to blend eyeshadows, but also to put a single eyeshadow colour on because the size of the brush makes it so quick to apply.
The F2 I have used for pretty much everything. But the favourite two uses I have are for concealer blending and applying highlighter. The bristles are so light that it blends effortlessly and also applies just a lovely dusting of highlighter to my cheeks.
Have you bought any brushes from MUA?