[luca_ing]

Absolutely seconded.

Decent support for ZFS in general, especially during installation already.

Ideally, ZFS root filesystem support (snapshot before upgrade, yay!).

I've been using ZFS for six(?) years now, on both Debian and Ubuntu, and while ZFS root is so important to me that I'm willing to jump through the necessary hoops to install it, it's kinda grating and perhaps riskier. And not for the faint of heart.