I personally don't beleive in aftermarket warranties. But then again I don't beleive in paying premiums to rip off insurance companies either.
Unfortunatly...they are both good to have JUST IN CASE. For the most part 99% of the people never use their factory warranties let alone an aftermarket warranty or extended warranties, so it's money down the old crapper.
If you are worried,buy it! But a good sound maintainance program, CarFax report, repair records and sound judgement should keep you out of trouble when you do buy the VX (putting a little aside every month for emergencies doesn't hurt either)
John