Nintendo WFC will shut down in May 2014

[tueidj]

It works fine as long as both machines can run at full speed and/or the game in question uses a basic PRNG (which permutates a seed each time a random number is generated). For games that use the PPC's timebase for entropy (or as soon as a machine experiences a framerate dip), it's extremely fragile and will actually become worse if/when hardware emulation improves (i.e. asynchronous processing).