We had a 2020 model for about 18 months. Simplicity and relatively low weight are great, and DIY upgrades are easy. We got excellent mileage on an older RAM 2500, so long as you minimize gap between cab roof and camper cabover, aerodynamics are good. Bed very comfy. Arctic tern windows are great.
They do (or did) cut some corners. All comments below pertain to a 2020 model.
Don’t bother with the 3 way propane fridge, its loud at night, fussy, and requires venting which lets in cold air. Go with more efficient DC compressor model.
We found 100 watts solar inadequate, especially with a DC fridge. We added a panel, could have added another.
Goal Zero 300 system was meh, we added two 33 Ah batteries for 100 Ah total. That worked for us and our laptops and gadgets.
Fresh water capacity way too limited. One might install wheel well tanks outside, then plumb them in, but obviously not optimal in the cold. We just lugged around jerry cans, not optimal.
We never missed having a gray water tank. Or a dedicated toilet or shower. But might feel differently with a lot of winter camping though we did camp in snow several times with no big complaints. YMMV.
Liked the Dickinson furnace, reasonably efficient, but it can be fussy to keep lit (clean burner regularly) and given its height, the lower cabin can be at least 10-15 degrees colder than upper.
Not a fan(!) of the Fantastic Fan, too loud, settings too coarse. Much prefer Maxxair.
because we stored stuff in the space between bed sides and camper, those wheel well sections took a beating. I would coat them w raptor or linex or other bedliner coating. Might want to do that under cabover and front wall too. Or even whole thing, depending on how much you like the highly reflective aluminum. It will scratch.
probably other stuff I’m forgetting.