I'm just starting my cellar and I've only owned this wine rack for two months but I couldn't be happier. The full capacity requires stacking 3-high, but I bought 3 additional shelves from the manufacturer to reduce space between shelves and stack less high. With the 10 shelves total, I can fit 90 bottles without stacking, but I like to stack two-high for wines I have multiples of. The ten shelves, if stacked two high now give me (9 + 8) x 10 = 170 bottle capacity, and even more (177 total) since I can squeeze a three-high stack on my bottom shelf.
Unless you're much taller than me (at 5'9") don't plan on browsing wines too easily on the top shelf. This is, however, a spot for stacking a couple of cases of your favorite cab (grab & go).
I was so pleased with the engineering of these units I purchased half a dozen shelving units from the same manufacturer. One of them will sit aside this rack for storing wooden cases.
As my cellar grows, I'll surely add another of these wine racks to the mix as well. I can't speak for the test of time, and how these will hold up against rust in a basement, but my though was that is would be reasonably hypo-alergenic, even if rust does develop.