As the most anticipated flagship cycling computer successors in the cycling world, the Garmin Edge 540 and 840 Solar faced a comprehensive extreme test upon their debut in Taiwan. From the real-time gradient response speed of the dual-band multi-GNSS positioning system in complex terrain, to the impressive battery life brought by the solar charging panel during the long-distance Tour of East Coast (Hualien-Taitung) race, every feature was put through the most rigorous scrutiny. The new ClimbPro climbing black technology, which automatically detects climbs without loading a route, was also demonstrated on-site, and the cross-country map navigation capability was even tested in Thailand. What qualitative leap can these two new-generation cycling computers, combining physical buttons and touchscreen, bring to riders' daily training and racing?