Living with the 2026 Mercedes-Benz E450’s been a treat: it’s a cozy luxury cruiser around town, yet tight and poised on twisty roads (0.92g skidpad grip, 70mph braking matching our last BMW M5). The $5900 inline-six AWD upgrade shines—smooth, punchy (0-60 in 4.5s), and way more fuel-efficient than rated (39mpg highway, nearly 700-mile range). But touch-sensitive steering controls are frustrating, and our loaded model hits $95,375 with some useless extras—though the 21-speaker Burmester stereo is totally worth it. Would you splurge for that sound system despite the flaws?