Well worth the money
I ride 10k to work everyday in South East Germany, and haven't seen the sun in months. Despite that fact, I have yet to have cold toes on my ride since I purchased these. I wear them with Pearl Izumi X-Alp Drift II shoes which are mostly mesh and have a larger profile than a normal road shoe so I went up one size from the recommendation and it worked perfectly.
To maximize the lifetime of these try not to let your foot slide as you come to a stop. Pretty common sense, but it took me a few days to learn that.