Put this way, OpenSolaris is like Fedora for RHEL (Redhat Enterprise Linux), OpenSuse for Suse Enterprise. OpenSolaris is a community OS for collabrative and new functions purpose instead of stable Production environment OS. It may be buggy and not stable since it not focused on professional Support and maintenance & OS QA.
Learned from different ways, SxNY Asia has decided to move all of Solaris OS ( 8, 9, 10) from Sun Box to Linux platform in HP Proliant servers ( about 200 units ). Panxsonic also decomm all of Sun Box into RHEL boxes ( 150 units ).
Compared with Linux and Solaris10, you will find out Solaris Volume Manager is very difficult to be configured which compares with Linux LVM. Most of production Solaris boxes have to buy Vertias Volume Manager which is an extra cost.
Good time of Sun Microsystem is no more. In May, Sun retrenched 2,400 staff. In November, it will retrench 6,000 head count due to poor server performance and wrong business approach.
In fact, compared with less downtime in Unix/Linux/Windows environment:
AIX > Suse > HP-UX > Solaris > Redhat > Windows 2003 > Windows 2000, Suse is better than Solaris