Oh man this is such a disappointment! I've had this brush for months and months but for some reason only just decided to share my opinion on it. I've always been a huge fan of Real Techniques and I swear by them but this triangle foundation brush just doesn't reach the same standard.
I initially bought it as I was intrigued by the unique design and as I previously mentioned, I'm a big fan of their brushes, especially the flat contour brush but I was bitterly disappointed. The bristles feel very synthetic, almost like plastic and nowhere near as soft as the other brushes in the collection. The brush also doesn't apply product very well so I find it hard to work with and quite time consuming to put on my foundation! I also found that it doesn't blend seamlessly as it claims so I'm afraid it's a thumbs down from me!
I genuinely love the rest of the Bold Metals Collection from Real Techniques but I just can't recommend spending £22 on a brush like this which will end up at the back of the makeup drawer!