I have this particular set for about 6-7 years. I am completely satisfied. For normal cold weather like the climate in Greece, it is perfect. You wear a sweatshirt on top and you're okay. It works for temperatures below zero, but you need to wear at least two cotton fabrics on top and up to minus 5 at most. Then you move away from the thermals and go somewhere else.
In terms of sweat, etc., yes, you sweat but it breathes and you don't have a problem with hypothermia. However, the fabric, being synthetic, holds odors and even after two washes, it can still smell like sweat, and that's because you shouldn't wash it in high temperatures or use fabric softener or other laundry detergent because it will ruin it.
Anyway, if someone wants to buy it, they should do it without a second thought. It's worth the money and more.