2021 Mercedes AMG GLE 63 S Review By TestDriveNow Car Critic Steve Hammes. With a top speed of 174mph and all of the wow factors like heated and cooled cup holders and headlights that turn on like pulling back a curtain, the GLE 63 S is for those who go all in on life and have the means to do so.   Mercedes has been producing some crazy fast SUVs over the past 20 years and this one here is the OG. Originally known as the ML 55, this all-new 2021 GLE 63 S carries the brand’s AMG torch into a new decade of decadent speed.