Quick backstory:
I had a very early build '15, and it was very definition of POS. (I know all about first year rules, but lease had expired on my '11). Replaced with '16, which was better mechanically, build still had the horrible ride quality of the '15--the dreaded 'vibrations'...
Now have an '18, and so far its been like my previous Cadillacs, aside from the '15 & '16, oil changes and tire rotations.
I find that my '18 ride is far superior to the '15 & '16, and not just because the '18 doesn't have the dreaded vibrations, it almost "Rides like a Cadillac". It's also significantly quieter than the others, not that they were noisy but they had far too much tire noise even on the smoothest of pavements. On the '16, the dealer traded out the OEM Bridgestones for Michelin Premieres, which help some with ride quality but didn't really do anything for noise. The '18 has the Bridgestones, but they're much quieter.
Whether you follow or not, J.D. Power ranked the Escalade #1 in initial quality in its segment, and I'm sure the '19 will be as well....
I say go for it, and make sure you get a Platinum!!