Can anyone offer an opinion or comment about this question?
Just one man's opinion.
It seems that the answer to this question is often shaped by ones approach to their XLR ownership.
If you are one that likes to modify their car or perform your own upgrades such as cold air intakes, brake modifications, engine tuning or other like-type activities, you might tend to switch to non run flats for what you believe will provide better handling or a better ride.
On the other hand, if you like the car the way it came from GM and are happy with the ride and handling, you might tend to stick with run flats.
I have made no modifications to my Crimson Pearl, with the exception of the addition of the anti-sway bar, which came standard on the V models.
I have decided to stick with the run flats for Crimson Pearl.
I am quite satisfied with the ride and handling and enjoy the added peace of mind of having the run flats. I know that the run flats are not perfect, so I upgraded my AAA membership to a higher level that provides for towing for a greater distance. Between the run flats, AAA, OnStar and 2 cellphones, we travel pretty confidently!
Others opinions may vary!