I have never had too much of a problem, Certainly down to the individual dealer, and probably more importantly, if you pass the "attitude test" going in shouting the odds etc, get you nowhere slowly !!!
The sport has being modified as you know,, and technically was bought "as seen"
When you drove it, the anti roll bar bushes were knocking like a good un, also needed a new viscous fan, etc,etc, all sorted under warranty !!
However, when i had a problem with the active cruise, (as it it was short of the radar unit) the local dealer could or would not sort it, so took a week or so with "positive attitude" talking to customers services,
They make the comment of " are you in contact with another dealer " so make of that what you will they got the car booked in the very next day with another dealer, and was all sorted under warranty,, (£2k worth) Thanks you Customners Services
If i have had a problem under warranty with any of the 110's etc, even though i had serviced them, they have sorted it out