I did, but the 4TB drives felt like the sweet-spot for price/capacity. I'm running raidz2, so the 4x4 gives me 8TB useable space, which is more than double what we really need right now. I couldn't justify the additional $400 price tag to go from 8TB to 12TB. By the time we run out of space again, I'm hoping the prices will have dropped significantly, as 8TB (and hopefully above) drives are a little more ubiquitous.