the speakers on the powerbook G4 don't work which sucks, headphones work though so it's not as bad as it could be. the ibook, due to being an 800mhz model, suffered from the GPU failure issue but I took it apart and put a spudger inside to put pressure on it and now it's perfectly stable. it also doesn't have an airport card which is a little annoying but honestly overall considering the powerbook was sold as untested and the ibook was sold as broken I think I got a good deal