First of all it struck me that it is free available for non-commercial use and this was a big like from me.
Text install is very similar with old Solaris install, it even have the same color scheme and "F2_Continue" shortcuts. The boot menu (grub) lets you choose between install over a local terminal or serial ports, I was pleased to see that compared to the horrors of past Solaris releases, a NMAP run against a newly installed system that shows minimal ports open, just SSH and port mapper.
There are also massive changes to how configuration is now handled in Solaris.
The desktop looks quite sharp and slick and i don't find it annoying at all.
One of the noticeable improvements in Solaris is the package manager. The ZFS Time Slider has also made its way into Solaris, another first-in-OpenSolaris feature. Time slider does automatic ZFS snapshots and allows easily rolling back files to later dates.
IP and data-link configuration is the obvious area in which the old methods were rapidly becoming clunky and difficult to manage; dladm and ipadm provide a much more consistent and powerful toolset. Review collected by and hosted on G2.com.