A roundup of recent reviews published by Engadget. Sam Rutherford for Engadget We've run the gamut of gadgets here at Engadget over the last two weeks. Our reviews team has tested a dual-screen laptop, a fitness wearable, an action cam, two telephoto smartphones, flagship headphones and more. If you missed any of the in-depth impressions from those articles, read on to catch up on all of the reviews we've published recently.  ASUS ROG Zephyrus Duo For the "more screens are always better" crowd, ASUS has a dual-screen laptop that's a gaming powerhouse. There's only one problem: It's very expensive. "There's a childlike joy I get every time I open up the Duo to reveal its two displays, and as an adult I really appreciate the extra screen space you get with its design — not to mention its excellent performance," senior reviews editor Sam Rutherford said.…