Careful with the set dedup=off, that or set atime=off commands, one of these very likely destroyed my zfs partition (I was on root and issued these after creation and installation)
Also the link I gave in my first post touch on the RAM usage and it depends on your data size and it’s not that bad …
EDITED: Sorry my original post was unclear.
EDIT2: I meant running these commands afterwards. I otherwise have great experience with a dedup=off pool which started as such from the beginning.