I used to have a Buffalo Special 6 Shirt a long time ago when I was a milkman. I used it day in day out for eight months through the winter. I was washed a couple of times a week, I used to use thermal tops under it. It was excellent.
I never got wet in it and I was out in all weathers. The surface got wet but the wind would dry it. I used to use the side vents all of the time to stop it getting too hot in warmer weather. I bought the hood when it got really cold (with my tips at Christmas as I recall), this made a huge difference to the warmth in very cold weather. The shirt was never cold.
The only damage was a rip from a gatepost, Buffalo sent me a repair patch free with instructions on how to repair the shirt.
My other tip is do not use the shirt under a goretex jacket, it will soon get waterlogged. Pertex seems to spread the water out over a large area to allow it to disperse, this clogged up my goretex, it needed to be dried out before it worked well again.
On the whole an excellent bit of kit.
Stewey.