it shouldn't be any different. VMK is always dependent on your computer and the speed of your internet connection. It should not matter HOW you connect, just HOW FAST you connect.
You might notice more hesitation and latency when playing VMK over a satellite connection. It takes some time for the signal to reach the satellite and come back down to Earth again; that will add some small delay to your commands getting through to the server.
Aengus... that really depends on the type of signal and a host of other variables. But it all comes down to how fast the connection is, no matter how he connects. a SatLan connection will be slower than cable or FIOS in most cases, but should be faster than DSL
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