I have a few of their cashmere sweaters as they don't irritate my skin like lambs/merino wool and are lovely and warm and last for years. I hand wash them in wool wash detergent from the Co-op range and add fabric conditioner to the final rinse,then dry flat. I also have a cashmere comb to de-pill the sleeves and down the sides where they rub. I've had one of their polo neck sweaters for years and it's my favourite on really cold days. In an 'emergency' when working away from home, I once de-pilled with a velcro hair roller!
I keep some older well-worn ones to wear under loose sweaters for extra cosy warmth.
Your sweater should last for years, but keep away from moths!