The advantage of subzero (the now-generic term for a certain type of fridge) refrigerators (Viking included) is that they're good for tight spaces (like apartment galley kitchens) because the compressors are on the top instead of the back.
The disadvantage of all subzero refrigerators (Viking included) is the every decade or so replacement cost - $7K-10K. Which is probably cheaper than downscaling to a cheaper standard-sized (i.e. shorter and deeper) refrigerator but then having to reconfigure your surrounding cabinetry to accommodate it.
If you plan on resale in the next five years it'd make sense, but what would make more sense is to spend more money on a professional six burner gas stove to wow non-cooks with.
Here's a pic of the inside of my fridge from a few years ago:
My house came with a subzero which was older than I thought; I was lucky to find one model - a Viking - that fit the space that was marked down from $7K to $5K because it was discontinued. They don't make refrigerators that size anymore so whoever owns this house ten years from now is gonna be screwed and have to reconfigure the whole kitchen. It's the only house on the block with a subzero because the previous owner renovated the sizable kitchen to maximize space.