The 2021 Trek Slash has been reviewed by several outlets, with many praising its performance on rough trails. The bike is described as a great all-rounder, with some reviewers noting its suitability for racing and others highlighting its ability to handle challenging terrain. Reviews of various models of the 2021 Trek Slash, including the 9.8 XT and 9.9 X01, have been published, offering different perspectives on the bike's features and capabilities.