No issues with my '16 XL over bumps...believe me, I know what everyone is talking about...my first experience with the booming was in a rental XL SLT in Hawaii on vacation last year...I made it bearable to drive all week by using Tow/Haul and Manual shift to keep it out of 4 cyl. We drove probably a dozen Yukon and Yukon XLs before finding this one...after driving a couple with 22's, and seeing the vibrations and crappy ride with them, I swore off the 22s (love the looks, hated the ride)...we preferred the ride of the SLT to the magneride on the Denali, and when I found one that had no vibes or buffeting/pressure, we took it. Now, the truck DOES still have some minor booming/pressure if left to the AFM and 4 cyl/8 cyl cycling, at very specific speeds. So, to avoid it altogether, I tried the Range device and the truck is beautiful to drive. I wish everyone had such luck, and I hope my luck continues (crossing fingers). Only issues I have seen are some weird electronic things pop up, and noticing a shudder when turning and light throttle...gonna have to have that looked at, seen some issues with Torque converters and trannies...