Powerbooks and iBooks iBook Rev. I work really fine, but had some probem of stability with Classic. It really a great job they done there. It isn't supported on DP 3, so you'll need to select 'unsupported install' from the menu of the installer. Almost everything works fine, but Classic.app seems broken, whereas MacOS.app has no major problems.
Installation is straightforward.
It's not very fast but still usable. Sound does not work. Starting the bluebox howerver crashes the system. I think the problem may actually be in the Open Firmware of certain model clones. If your mac doesnt support it, it will just hang at startup and display nothing - which is exactly what my clone does.