Yes, you read that right. 10 years. The key? The quality of the brush and the Bobbi Brown makeup cleanser (I'm not sure if Birchbox sells the cleanser, but they should!). The brushes are incredible - I love them - and they last forever (if you take care of them). Definitely a great investment and worth the price.
Bobbi Brown has never disappointed me. I've never regretted buying any of their products. I bought this brush because it was made specifically for bronzer; also because I found the reviews to be favorable. I don't wear foundation but I do wear bronzer on a daily basis. This brush smoothly applies my bronzer without streaking. It's a high quality brush and I highly recommend it!
I've had this brush for over 5 years and it still is just as good as it was the first day I bought it. One of the best purchases and super great quality- when I use other brushes I don't achieve the same blended look. Highly recommend!