Bet you're excited. Congrats on the decision.
We have the 2015 QL400 and love it.
No major problems yet. But only have a couple hundred miles on it. But camping in the yard for a few weeks and everything seems to be working very well.
The only embarrassing moment I had with mine was not being familiar with air bags and the air system. First time I took it out of the drive and down the road, I felt like I was riding a mechanical bull trying to throw me out of the seat. DOH!
I didn't give the air bags a chance to inflate.
Now, life is good.