I went to a Benefit counter in Debenhams and the Boi-ing concealer was recommended to me. It was applied with a little foundation brush and I was really impressed! I was a little worried that I wouldn't be able to apply it very well as I don't have a concealer brush, but I've discovered that my fingers work just as well.
The concealer feels quite hard when I first dab my finger into the pot, but it blends really well into my skin after warming it. I have really bad red blemishes on my cheeks (thanks mum!) and Boi-ing easily covers those too. Hopefully you can see how well any redness and under-eye shadows are covered by it in the photo above :) At £16.50 Boi-ing isn't cheap, but I love it so much that I won't hesitate to buy another one when this pot runs out.