Nicole, I have this sweater in black and cobalt, and have worn both numerous times. I have yet to wash either, although I have dry-el'd them and I have had to use the lint brush on them quite a bit (if I wear my puffer, I wind up with white fox fur all over my sweater)! I wore both constantly on our trip to Iceland and to Philly, including in the car and on the airplane, with other one packed in suitcase. I wore the black one to go dancing all night long in Iceland, working up quite a sweat.
Despite all this abuse, neither one has pilled at all; they both still look brand new.
In my experience, BR's merino wool wears very well. In fact, I have some merino wool sweaters in my closet that I've owned for over a decade and they still look brand new. I don't wear them much anymore, because they are simple, plain, v-neck sweaters and not as much fun as cardigans. But I used to wear them to work all the time over a crisp collared button down.
Cashmere and cotton is a different story (it's all over the map), but the BR merino wool tends to be a safe bet each year. I find it is very warm (as warm as cashmere) but streamlined, so you don't get all the bulk.
Of course, I should add that I try very hard to only hand-wash my sweaters once per year (if that!). The less washing, the longer they last, in my experience. I dry-el whenever the sweaters start to smell; otherwise, I simply use the lint brush and air them out between wears. They don't get that smelly because I am always wearing a knit or blouse underneath, I never wear perfume, and I don't smoke (anymore). However my older merinos had to put up with my smoking; I would dry-el them after each wear, and they still look as good as new, no pilling.
Which BR sweater pilled after one wear?