Wiikey features:

Fully configurable and updatable via DVD update disc       (BCA game support)
Advanced automatic region detection with fallback (works even if a drive is changed to a different region Wii)
Region override for Wii and Gamecube games
Direct Boot of Wii original, import, and backup games
Direct Boot of Gamecube original, import, and backup games
Direct boot of homebrew in GC mode
Supports multi-disc games, DVD-R, R, RW (no bitsetting required)
Supports Dual Layer
Supports factory made 'silvers', even with incorrect header data
Supports, SMG, SSBB, Mario Kart and other 'problem' titles
Streaming audio-fix for Gamecube games
Diskspeed configurable via DVD, with separate settings for different media types
Recovery mode makes it impossible to brick the chip with a bad flash
8Mbit onboard flash for storing data and applications
Rock solid performance with 3.3V FPGA core and high quality components
Multifrequency Ringpiece Oscillators (MRO) for optimum performance, even with problem drives
Onboard status LEDs