Granted my experience of Harkila has been with Roe sacks and wellies but I have not been impressed and found their kit to be of really poor quality at an exorbitant price point and would avoid them at all cost.
I have a pair of Swazi driback fleece trousers which are 8 seasons old now.
They are very comfortable, very quite and pretty much look like they did when I got them new.
Worn with gaiters they are like fleece plus fours, warm and quick drying I really rate them.
You don't have to buy direct from NZ either, the guys at Swillingtons offer a good range and great service, I recently got a Swazi Kagoule from them cheaper than I could get it from Swazi.
Kind regards
BP