the new IPS package manager is okay. Doing image-updates has reasonably worked well too.
Haven't tried this at all... if it's "free"[1] I will. If it's a large extra cost, I'll stick with PCA :-)
Also, do to the nature of many of the Solaris patches (which require reboots), the LiveUpgrade feature has been a life-saver. Not as necessary in the Linux world, but at least now I can patch my production servers more easily without scheduling a couple hour sof downtime. :)
IPS is only available on OpenSolaris. I don't know if your support contract includes OpenSolaris...and then again, you probably don't want to use what many sun admins call a steaming pile of beta crap.