I have an X2 Elite laptop and the battery life isn't great. I'm not sure they're much more efficient than e.g. Panther Lake. A bit faster but... eh. Not sure ARM is worth the hype.
Nvidia's RTX Spark SoCs hope to bring new life to the Windows on ARM platform. These chips are designed for high-performance in slim and light laptops, with a long-lasting battery, to compete with Apple.