I am super hard on my equipment and in the few months I have had my Alpha SL I have not been impressed. I am actually on my second jacket in three months, my first one I had a full seem tear out but my second one has been better.
Pros: Lightweight, athletic fit, high collar
Cons: Poor construction, price
It use to be that you got what you paid for with Arc'teryx but since selling out to Columbia a few years back their quality has suffered while their price has continued to go up. Don't waste your money buying the Arc'teryx name when all you're getting is Columbia quality.
Recommendation: Buy the OR Zealot or a Marmot. Better quality and you will pay about half the price.