The GL450's second-row seat is mounted a bit too low, but offers good thigh support. Plastic cupholders are molded into the center armrest right where a passenger would place an elbow. Knee room is good, but foot room is lacking. Plus, exposed metal seat frames could damage expensive shoes. The third-row seat sits tall with good thigh support, but leg space is at a premium for adults. Foot space is decent, and the walk-in feature automatically powers the front passenger's seat forward for clearance. Unfortunately, that seat doesn't automatically return to its position once everyone is aboard.