I have the Ibex Amparo jersey and, like it mucho. I also have the short sleeve version (newer so it has the three pockets in back) and, it rocks too. It's amazing to me how the Amparo keeps the chill off yet, when I am sweating it seems to breath well thus providing a cooling effect. With the polyester (aka plastic) jerseys I don't feel the same evaporative cooling taking place regardless of the type plastic jersey or, it's associated marketing hype. They knock the chill off pretty well though.

When it's less than 50 degrees I put an 18 micron merino long sleeve undershirt on then, the Amparo on top. Real comfortable.