For thoe not familiar with ruthenium spark plugs, here is a bit of science as I understand it.
In spite of latter and apparently superior materials such as iridium, many race cars still run copper spark plugs. One reason may be because they're replaced so often, but the fact is that copper is more conductive than iridium and provides a better spark. The problem is copper only lasts a fraction of the time iridium will last. They moved to iridium plugs was not for performance or efficiency, although there's certainly nothing wrong with them, was to have 60,000 mi and 100,000 mi spark plugs.
The advantage of ruthenium spark plugs, and the reason I believe they are absolutely worth every penny, is that they are at least as durable and long-lasting than iridium if not more so, while having every bit of the conductivity and performance advantage of copper plugs. This makes them the optimal option for daily driver high performance vehicles, with high compression ratios and especially for compressed charge engines.
I hope this proves helpful.