Vantage daily driver here also.
SciFrog's comments are pretty much spot on.
I pay exactly twice as much to service my 09 Vantage as my past P-cars.
Mine has been very reliable, only a flat tire tyre (my fault) so far, although there were some very minor trim built quality issues that were quickly and flawlessly rectified by my dealer.
Now that I think of it, there has been one minor issue of the car stalling sometimes when idling, but instances are few and far between. Have not been able to replicate it in a closed environment so the dealer didn't know how to rectify that issue.
Another niggle is that the multimedia/satnav controls (mine is an 09 with the "upgraded" console) are absolutely terrible and unintuitive. Gear knob also obstructs the primary joystick that controls the system... an absolute ergonomic failure.
Otherwise, the car is flawless. The beauty of the exterior makes up for (almost) anything. - Picture time
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Tom
09 AMV8 Vantage