The one I chose - back in August, in preparation for my trip to San Francisco (anyone familiar with San Francisco's infamous fog will understand the urgent need for a coat in high summer!) - was the Dietrich swing trench from Collectif Clothing. It arrived some days later, without a button - not a good start, especially with my flight only a few days away. But I phoned their customer service, and (after first offering an exchange) they sent me some spare buttons straight away, along with a goodwill giftette of a handbag mirror.
Missing buttons aside (I also had to sew on another which fell off a couple of months later), I'm very much in love with this coat. I get compliments on it all the time. And it's certainly fulfilling the brief of midweight coat, perfect for grey autumn days which are too chilly for a light jacket or cardigan but don't warrant a winter overcoat. So, score.