COW and volume management?

I did actually try it once for a little while in the early days when the hype was at its peak. From what i remember the ZFS design had some issues around requiring huge amounts of kernel memory which presented a big problem for alternate implementations even on license compatible systems like the BSDs and it quickly ran out of memory on systems with the 2GB of RAM that were still common at the time. Overall I was not very impressed, especially since 90% of its supposed advantages are meaningless on the small scale of just 2-4 disks or so that you might have in a typical home system.