If you are in the market for lightweight, warm and windproof Vest this is the best product you can get for this price range.
I've used this vest throughout the Colorado Rockies and during my business trips, and I would say this is one of the most comfortable & good looking pieces I've owned.
I would certainly give it 5 stars for great build quality!

The vest has done a wonderful job keeping me warm all winter. Looks very nice, good quality, and built to last. My only recommendation would be to get the lighter version of it, since it's much warmer than it looks.

To be so light, it is so warm.

This is my favorite vest by far for snowshoe racing, in negative degree winter weather in Maine!

Found this version on sale so bought the Ramble Red which complements my Patagonia French Red Down Sweater Jackets, Non-hooded and Hooded versions, making a complete set in red color. The Ramble Red is a bit darker than the French Red which is slighter brighter.
The vest fits true to size and fits nicely over a base layer shirt and a light/midweight fleece with enough room for a heavier base or mid layer. It's not thick as a regular down vest but warm enough, at least indoors and in temps from mid-30s F and above.
You'll need to wear it under a warmer jacket or shell for Cold, wintry weather.
The ripstop fabric is lightweight and relatively thin so it won't hold up well if you use it harshly.
There's no fleece inner liner in the hand pockets so you'll need to keep some gloves in those pockets as well as gloves.
It's Expensive, hence Patagucci, so buy when it's on sale :)

Great vest very warm everything as expected.

Little late getting this review out. I got this vest for my husband, and he loves it. He wears it about every day. It looks great. It's all he needs on more mild winter days. He got a medium and the fit was perfect. Also love that the down is gotten humanely.

Best vest i have ever had! keeps you warm all day and looks really good! I would totally recommend this to anyone!

It gets cold in South Dakota, and I'm an outdoor photographer who isn't afraid of the coldest nights. This vest is great when riding in the truck and jumping in & out, but it doesn't stop there. It's so thin it's an easy way to boost warmth under my main winter parka when the temperature hits zero F and is still in a free fall. It's hard to believe that something this thin and light could be so warm! I've worn it almost everyday since receiving it last month (in temperatures hovering near zero F) and would buy another one of these if something happened to this one. I wear under either an Outdoor Research Floodlight (lightweight jacket) or under a Mountain Hardwear Absolute Zero parka when the mercury is hiding in the thermometer's bulb.

Kent in SD

My father loves this vest. He likes this better then the ultra light down vest because he wanted more substance to it. He loves the fit, how warm it keeps him and it looks really nice.

This vest is nice. It's surprisingly warm and seems durable. I also have a Mountain Hardwear Nitrous jacket, and this is definitely thicker than that. That isn't really a benefit or a drawback, but note that it is pretty thick and pretty warm. The price is really high though. I got mine on sale and it isn't hard to find this or similar down vests from other manufacturers for the $90-120 range.

As for sizing, I'm 5'11'' and 175lbs and the medium fits comfortably with a lightweight fleece underneath. I have a little room but not too much extra.

Fits great. Really warm. Color arbor green is the same as picture.
Fully recommended.

I originally ordered an XL by mistake, and had to exchange. The Large was a perfect fit for my man; but it does run a bit large. Being a puffy, it packs easily for hiking but fluffs right back up. If you've never owned a vest, they are worth the splurge to regulate body temperature without over-heating.

I absolutely love this vest and it is by far the best vest I own. It's amazing how warm the vest is for being so lightweight, and I love the feature of being able to pack it into its own pocket. This makes is great when traveling and/or backpacking. I would definitely recommend this vest to anyone who is considering it.

Sizing just off for me on this at 6'/180 lbs/41" chest. Large was just big all around (gut/mid-section & chest), exchanged for a Medium, which was just too tight in the chest. I just happen to be right in between on Patagonia sizing on that vest. Thanks to Ben @ BC for being so patient with me on all the exchanging. I finally settled on a Arcteryx Cerium LT vest in Large which fits perfect.
Still give this 5 stars since it's a solid vest...just my wacky body type/size doesn't jive with Patagonia sizing.

I'm sure this vest is a great piece if it happens to fit you, but the sizing is really weird. I'm 6'2" and 195 lbs. Based on other reviews, I knew it was probably going to be on the big side. And Patagonia says up front it's not a slim or athletic fit vest. But I'm fairly tall so I wanted it to be long enough. Well, an XL is long enough. But it's also big enough to fit an additional person. If I had an extra 50 lbs of beer belly it'd probably fit just great (hey, gotta have goals, right?!).

True to size, warm and functional. Good buy!! Backcountry is easy to work with too. Can't go wrong.

Great placement of pockets. The material breaths easily when slightly zipped (probably just a consequence of no sleeves, but hey). Slightly puffy, without being all puffed up in your field of view, in your face, or making you feel weird. Looks great. Just buy one now.

Love the quality, style and functionality of this vest. Haven't had a chance to put it through the wringer quite yet, however.

I wish this vest were a little more form-fitting. I'm 6'3", 200lbs and a size L is somewhat spacious. I didn't want to compromise the length so I stuck with a large.

For some reason I used to be a vest hater. I'm not really quite sure why, but once I realized the incredible versatility of a puffy vest, I was hooked. I actually own both this vest (in black, picture below) and the Patagonia Nano Puff Vest. The down vest is certainly more lofted and warmer relative to the Nano Puff, so I choose which vest to wear based on the temps and expected level of moisture (Nano Puff is synthetic and performs better when damp).

Photo: Enjoying a Rainier Beer on the Tokasitna Glacier at Mount Huntington Base Camp, Alaska Range.