Rating: 4 / 5
They are comfy down to freezing, but aren't terribly wind resistant. Thus, I pair these with OR basic shell mitts (goretex) and have used this combination down to the teens. It's comfortable in those temps when active, but IMO not beefy enough for sitting around in those temps.
I recently had a brutal experience that was a testament to their warmth and limits: I was winter hiking above tree line with summit conditions in the upper teens and a brutal wind. Anyhow, I lost one glove on the way up so that one hand only had an OR basic shell mitt keeping me warm. The difference between the gloved and bare hand was startling, basically amounting to feeling vs. numbness. Luckily, I found it on the way down.
In short: paired with shell mitts, they are great in above-freezing temps. As some have written they need plenty of babying if you plan on using them as your sole handwear. Mine have some small holes from rubbing up against granite, but this is well within the limits of claimed durability. The would earn a five if they were a bit more wind resistant.