In my experience Quietgirl, Boden cashmere, (and cotton, and merino) knits are absolutely EXCELLENT. One of the best along with COS, Talbots, and Polo Ralph Lauren. A lot of my knitwear comes from those brands.
Sweaters run TTS. Typical British brand sizing. (Smaller than the Loft. J.Crew - hard to tell. Their sizing can be TTS or run big). Use the size guide. It's accurate.
20% discount at the moment.
This is currently the Boden cashmere in my wardrobe. The last stripe is brand new. The navy stripe I got last year. The solids are 4 to 5 years old. Zero pilling! I dry clean my cashmere.
Hope that helps!