The service includes the processor upgrade and full installation and testing of the upgraded computer by trained technicians. The TiBook upgrade service creates a path for PowerBook G4 owners to obtain faster clock speed and higher performance, according to the company. "The end result is maximum performance gains and 100% compatibility with existing hardware, RAM, and software--qualities that you have come to expect from a Sonnet upgrade." After receiving the order, Sonnet sends out a custom, padded shipping box for the PowerBook. The customer packs the PowerBook, ships it back to Sonnet, where it is inspected, upgraded and tested, and then packed and shipped back. The PowerBook G4 TiBook upgrade service is $500 (plus tax where applicable). Shipping is extra. It is available exclusively through Sonnet Technologies for customers living within the United States and supports systems running Mac OS X 9.2 and all versions of Mac OS X, including Tiger.