Real Techniques brushes are already such a famous product! I was lucky enough to purchase them at a discounted price through a lucky box a while ago. I had been hesitant to buy them because of the price, so I used them with high expectations, and they turned out to be soft and quite good. My skin is on the sensitive side, so there have been several times when I felt a sudden rough sensation even after using a brush just fine, but I am satisfied because this product didn't give me that feeling at all. The bristles can be neatly tucked inside the case, so it seems hygienic as well. I plan to buy them again when they go on sale and continue using them!
(I have several brushes, but the one shown in the photo is the one I use for shading.)