The first generation of this well-heeled family SUV (the Mercedes GLS) saw the light of day in 2007. The only German vehicle to offer 7 seats, the GLS was recently joined by BMW, which launched the X7. Mercedes has decided to make an update and have a 3rd generation model in 2020. In this review of the 2021 GLS 80 4MATIC I will tell you what has change and what makes it stand out.