OK... I looked at the sight.
My thoughts...
Pros:
1. No need for cooling or heatsinks - The power supply fan can serve to circulate the oil through out the system, if not, then convection generated by the hot components will also serve to circulate the oil
2. Looks pretty cool seeing a computer sitting in oil
Cons:
1. System must be assembled first, before immerson any dissasembly would require plucking the system out and applying liberal amounts of dawn to get rid of all the oil
2. Oil can interfere with electrical conductivity, if oil gets between any of the connectors, system don't work!
3. Oil can turn rancid
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I live my life to prove wrong those who said I couldn't make it in life...