From December 22nd, 2016 to March 28th, 2018, 50% user give 3-star rating, 50% user give 1-star rating. for Amplifier AMP/Canonical switcher chrome extension.
seems to detect most amp pages, but virtually never switches, either automatically, or on clicking its icon. worthless, ultimately.
Reliably detects AMP sites, switching works. Though it doesn't switch automatically, ignoring its only setting.