Wow, that QX56 is almost ridgeline ugly! Maybe it will grow on me over time.. but doubt it.. the rims are fitting in conjunction with the overall look it is going for.. whatever that may be. Escalade probably won't be jealous..
On your point.. I wonder on the balancing.. as you'd think with rim manufacturing, you'd think rims would be pretty well balanced pre-tire, right.. so then with the larger rim, as you require less rubber, and especially "outer" rubber, most prone to that gyro effect.. and rubber being more likely to have imperfections in weight distribution over the rim.. so ultimately, although I don't like the big-rim look and function.. they may actually have one advantage.. better balancing..