Pros: They just work. Wool-free. Durable.
Some people are sensitive to wool, even merino wool. That would pretty much describe my whole family. So, we go with synthetic fibers for socks, base layers, etc. That reduces the choices for ski socks, but there are still options.
Having had good experiences with Thorlo socks for other sports, I grabbed a pair of these socks when I saw them on the rack at REI. These are Thorlo's thinnest ski socks and are comparable to most other manufacturer's thinnest ski socks. In my Salomon Falcon 10s, they feel great. They are comfortable, warm and dry. After numerous days, they're holding up well. My foot stays put in the boot.
In terms of thickness, these Thorlos are thinner than Eurosocks Ski Superlite. They are slightly thicker than Wigwam Snow Whisper Pros. They are thicker than Bridgedale Micro Fits, which are practically panty hose.
I find my similar-vintage Eurosock Ski Superlites are starting to wear through at the toe. My Wigwam Snow Whisper Pros tend to feel slippery inside my boot.
The Thorlo High Performance Ski Socks are the ones I keep reaching for. They do the job and I can't find anything wrong with them. Definitely recommended.