couldn't tell ya.
never bought a new vette.

now, ya don't have to get to humble :-)

The people who are going to sell you this policy aren't doing it from
the goodness of their hearts. They do this for a living and they are
convinced that all things considered, your repair bills for the life
of the policy will be less than what you will pay for the policy. They
have plenty of experience with the people who get a warranty so they
can drive it hard and not worry about breaking it because the
"suckers" that sold them the warranty will pay for it.. They also know
that people who take good care of their cars and don't break them tend
to pass on the warranty. Given these considerations the people selling
the warranty price the policy so they always average a profit.

If you know something they don't, go for it. If you aren't sure then
you're just the type of customer they're looking for.

I'll toss maybe a different slant on this.

Since 2000 we've bought two new Buicks, one GMC truck and an used 'vette.

Most of what goes wrong with the new vehicles is nickle & dime,
infant-mortality stuff and usually not related to Powertrain or major
body.  I don't want to work on either the truck or mama's Buick (can't
stand the heat) and don't invest in a shop manual.  So, the dealer gets
those jobs.  Since the 2000 model year, I've had two window snubbers
fail (one in the truck, the other in a Buick.) Both failed beyond 36K.
Other items that crapped out between 36K and 50K included a cruise
control switch in the steering wheel, a twilight control module, a HUD
projector, replacement of an OnStar component and recentering of
steering to calibrate Stabilitrac (which needed attention shortly after
the cruise control switch replacement--GMPP stops call-back arguments,
period.  Another problem covered under GMPP was a serpentine belt
tensioner.  The dealer suggested also changing the belt which would
require removal of a motor mount.  I opted for the belt and paid for it.
 GMPP picked up the cost of pulling the mount.  Without GMPP, I'd have
paid for the tensioner and might have considered leaving the old belt in
place to avoid paying for R&R of the motor mount.

Once infant-mortality stuff is cleared up, I'm used to getting 30-40K of
clear sailing with few repairs. I've had two exhaust issues (one on a
Buick and one on the truck.  Both were taken care under GM's 7 year,
70,000 emission control warranty -- something you don't pay extra for.

The 'vettes are different.  I get the shop manual and 'bend wrenches'
for fun.  I have no need for an extended warranty and feel, like others
who have posted here, that it's a sucker's deal.  Don't feel that you
are a victim of automobile electronics and computers.  Many independent
shops can scan the ECM for diagnostics at 1/2 what the dealer would want
for a diagnostic run.  (Issues handled by the Body Control Module may be
best taken to the dealer.)  Yes, per mile, 'vettes throw more codes than
do Buicks or trucks but the problems, most probably, aren't beyond your
management or, maybe repair.  Generally, I think you'll find more
reliability in a 'vette's electronics and air conditioning than in
something from Europe.