I assume you are talking about OpenSolaris?
I agree, OpenSolaris' install is easy, that is if you can get it to install on your machine at all. It won't install on my machine because of some incompatibility with my DVD SATA drive (a very standard drive). I confirmed this with some devs on the Solaris forum. I have similar problems with some of the BSD's; I can't run NetBSD or PCBSD on my machine at all. However, DesktopBSD works fine, provided I turn off ACPI.
I can run OpenSolaris from virtualbox and I like it quite a lot. It still has some growing to do, as the first stable release (2008.1) only came out a few months back. The ZFS file system is unparalleled in the Linux world, as is DTrace. Linux really needs to acquire ZFS -- Mac OS X and BSD already have it. Sure, Linux has a user-space port already, but user-space is not ideal and wont provide optimal performance. Last month Linus Torvalds met with the Sun developer who created ZFS, so I am assuming it was to negotiate official terms of porting ZFS to Linux. Solaris is under a different open-source license, so I am hoping they change it to GPL.