I have an 15" 800 MHz G4 TiBook that's nearly four years old. I have a dual 2.0 GHz G5 PowerMac, but I end up using the TiBook about 80% of the time, it's just too convenient. I've hauled it all over the world and it's come through like a champ. The performance with Panther and 768 MB of RAM is still great, it doesn't feel like an old machine at all, and the screen still looks great (I treat it well and keep it calibrated). I use all kinds of stuff on it including Cinema4D, Photoshop, After Effects, InDesign, Xcode, Cubase, and Final Cut Pro. If you're doing heavy duty 3D rendering, using Motion, or you want to play the latest games at high framerates, the PowerBook might not be for you, but for anything else, it's great. It's my 3rd PowerBook (2400c, Pismo, and TiBook) and they have all been excellent, well-crafted machines that I regretted parting with.