I have owned a GC for 8 months, prior to that I owned multiple motorhomes. I am 100 percent happy with the camper. As an engineer with a keen eye on build quality, I can tell you that (with the exception of press latches and AGM battery) no cost has been spared in the manufacture of this van. The build quality of the interior is outstanding. The bed frames (upper and lower) are very strong, fabricated from welded aluminium. The corner section of the bathroom walls, travel seat, and rear cabinets all used extruded aluminium sections. There is not a wood screw to be found. The lower cabinets at the rear are bolted to the floor with up to 16 fasteners (competitors use 6 to 8 wood screws). The high roof is ugly yes, but looks better with the solar panel fitted. But the additional hight is a game changer for interior space, while I'm only 5'8"(172cm), other van conversions without a hight extension feel claustrophobic. If a van has a pop top then you loose the ability to have skylights over the beds and in the bathroom. The skylights in the GC are fantastic. The hight top also means you can have a proper shower with the outlet positioned above the height of your head. Also things like the bespoke ceiling and wall moldings (instead of glued fabric) are very expensive to produce. You rear bed can remain dressed, and the bedding, pillow and ladder for the top bed fits on the bed when it is in the travel position. Therefore none of the presses are taken up with bedding or ladders.
With regards the white interior, it's certainly not for everyone. After so many motorhomes I kind of like it for a change, but understand it could be a deal breaker for some. It had a few minor design flaws, like clothes falling from the aircraft style presses, but I have engineered a solution with 3D printed parts and elastic cord that works great and does not require any alteration to the interior of the press.
In summary, if you are 2 adults, 2 adults + 2 kids, or 2 adults and one larger kid (up to 5'6"), than this is a fantastic year round camper. IMHO it's overall interior build quality is unsurpassed and a bargain when compared to competitors. It's not cool, but it is excellent as what it does.