What I liked:
1) VTs finally work in illumos installer, it's good to have a possibility of going to text console and checking installer's log.
2) It seems, the installer can install system on mirror pool. C'est beau.
3) APT... I finally shouldn't learn one more package system and apt is IMHO faster then IPS.
4) It's still Solaris: you have DTrace, ZFS, projects, fair share scheduler...
5) git change number in place of OS version looks cool :)
# uname -a
SunOS oi-test 5.11 4cece89cac3e i86pc i386 i86pc Solaris
What I disliked:
1) Zones don't work:
root@oi-test:~# zoneadm -z myzone install
sh: exec: /usr/lib/brand/ipkg/pkgcreatezone: not found
And Solaris without zones is a very strange thing...
2) /usr/gnu/bin in front of path... How can you use GNU chmod with ZFS ACL?
3) Soft, soft, soft... Where are you?
root@oi-test:~# apt-cache pkgnames |grep postgres
4) apt-clone doesn't work
This is just a first glance on this OS. It is very raw and is still in development. I doubt that calling this release 1.0 was a good idea. It seems, we will have a production-ready OS not sooner then in half of year, but still... I wonder, what Illumos-based OS will be first to reach production quality: OI or Illumian? It seems OI is in better form nowadays, but the fact is that OI team has failed to create a stable release in about 1.5 years.