This is what I do, to try out ZFS in a "safe" and easy way. An HP Microserver (my home server) with a USB3 disk attached formatted as ZFS. The server still runs Debian stable and uses DKMS ZFS. The recent pain points have only been the time taken to rebuild the kernel module for kernel updates and there have been a lot of them over the past few months (due to all the CVE's found and fixed). The ZFS side has been plain sailing so far but if I hit any ZFS issues I may have trouble (but, as I say, it's a test anyway).