Loving it!
Now, my storage needs are fairly modest in comparison to the author. I'm running with RAID-Z2 and at 44% capacity. I have this unit in my work workstation, at an external office. It is quiet and cool.
I used to have a big house with a room I could put a bunch of computers in. I moved to a smaller house, but more importantly I was just tired of managing a business-class infrastructure at home (VLANs, multiple APs, UPSs, batteries, patch panel, servers, etc).
So I copied a backup of my storage server from an off-site box, to S3 with Glacier, copied the primary to this ZFS array on my workstation, removed junk I was just holding on to, and now my home infrastructure consists of a Cable Modem and Google WiFi mesh. Huge improvement in maintenance!
Here's a blog post I wrote about one of the previous incarnations: https://www.tummy.com/articles/ultimatestorage2008/