I bought a 2014 GL 550 w/ 40K miles in 2017 for $55K (original MSRP $95K in 2014 -- sharp depreciation!). Had been part of MB's certified vehicle offering. What a spectacular vehicle for the money! This big MB is so fast, and handles so incredibly well that I find Texas's top, 80-mph speed limit to be frustratingly low. Although intended for the US market, this twin-turbo V8 with wide, performance tires would be more at home at much higher speeds on Germany's autobahns. The brakes are every bit as impressive as the engine. In addition to almost preternatural performance for such a big vehicle, the interior comforts are also great, starting with the Harmon Kardon stereo, but also the massaging, heated & cooled seats, and triple sunroof. I'm not a fan of the cumbersome navigation system, however, and children over twelve are uncomfortable in the third-row seats. Finally, the MB dealer here in San Antonio has been delightful to deal with for routine maintenance.
Owned the car for a few years, put 64k miles, no problems, only regular maintenance which actually doesn’t cost that much. Oil change with filter only 130$ at the dealer, I think very reasonable, in comparison I paid 400$ for oil change for my cayenne so I’m pretty happy with reliability and cost of ownership. Resale value of course not great but it’s a good thing for people who buy this vehicle used. Great fit and finish of all the interior components. Headlight performance is not best but I updated the bulbs and it definitely made an improvement. Great acceleration and handling despite the size and weight of the vehicle. Would recommend it to anyone! Love mine