So far our x18d has been really great for us - we graduated from a small pop-up to it This year.
The things I am not so in love with is 1) the couch area, not super comfy and shallow seats, but we are supposed to be outside so I look past that. 2) the overhead storage above the sink are just large square cabinet, must get some containers for organization and 3) there is no real window on the door side beside the little one over the sink. But again we should be outside.
Most of these points were addressed in the 19 but the third bed made all these not matter. We have so much room in there it is amazing.
Love it and it tows awesome.
16 Jay Flight 27BHS
15 Ford F150 3.5 EcoBoost - Max Tow 3.55
Blue Ox WDH
Retired: '94 Coleman Pop-up, '14 Jay Feather X18D