The 2021 Trek Slash 9.9 has been reviewed by several outlets, with some focusing on its performance in timed events and others on its overall riding capabilities. The bike's features, including big wheels and long travel, are noted for handling rough trails. However, there is also mention of a 2025 model, the Slash+ 9.9, which suggests that the bike may have undergone updates or changes since the 2021 version.