I use a Cumulus (Poland) Down sleeping quilt which I imported from Slovenia. Took about 5 days and cost about £200. I believe it works at its best when married to a proper mattress, in my case a Thermarest NeoAir, with a fitted sheet, also from Thermarest. On warm nights its great, I just use it like my home quilt, when hot I just throw it off me. In the colder months keeping warm requires a bit of a knack, either to have 2 or 3, 12"elasticated ties, secured to little loops to pull the sides together and under me, or to wear long johns, possibly socks and an upper body warm jacket. I tend to use the second option most. I use a compression stuff sack, covered with another waterproof stuffsack and my quilt stuffs down to a really small size. Its also rather light in weight. I have never let it get wet, I have read, that once wet, down products become pretty useless until they dry out again. I've had my product for over three years now, still looks as good as new and only one or two feathers have ever poked through. I was it each year, can take a week to dry but the wait is worth it. From my experience I think I would always buy a down product (but not a down jacket) because of its light weight and compressibility mainly and it keeps me warm as well.
Having looked through various models recently if I bought again I believe I would go for the 'Enlightened Equipment Revelation 20', looks good but importing it from the USA?