Yes, I knew all along it should be supported, but it was missing from Apple's supported Hardware list... now we know, and I can buy a Family pack for my iBook and my old Pismo (and probably my father in laws Mac mini, even if he, technically, is not a part of our household... )
A buggy OS is usually indicative of something wrong with your system directory, permissions, bad preferences, cache, or installed drivers. That would not be solved by an upgrade to Tiger. My suggestion is if you have a buggy system, be sure to back up all essential data prior to upgrading and Archive and Install. And if that doesn't work, then erase and install.