Before I bought this jacket I had not heard of First Manufacturing Company, so I first did some reading to learn more about the company's reputation and the quality of the products. Although most reviews were positive, I did find some poor reviews that cautioned about the customer service and issues with poor quality, but on the strength of the reviews on this site and elsewhere I went ahead with the order. I'm very glad I did, as my experience was excellent and the jacket is very nice.
I am a 5'10" 175 lbs male, and originally ordered the medium based on the size chart. It was too big so I had to exchange it for the small. The small fits perfectly, with or without the armor (sold separately) or the insulated liner (comes with). Exchanging the product was perfectly straightforward and the replacement arrived soon after. The quality is excellent and it looks very sharp.
If you're on the fence about ordering, I say go for it. The product cannot be beat for the price, and is a fine garment at any price.