Run flat vs. regular tires.

I know this has been discussed in this forum before but I want to clarify 
something.

We got 40k out of our first set of run flats.  I went to the tire center 
(it's all they do) and was told:

- no difference in ride between ride flat and regular tires.

- because of the low profile isn't able to dissipate heat as well as
larger 
tires I can expect 10-15k out of the new set for city driving and double 
that for highway (that amounts to a set every 12-16 months).

- none of the manufacturers they carry (which is most) offer a low profile

tire with guaranteed mileage.

Given the wear would be consistent, I selected a set of high traction
tires 
for $117 / tire which was half the price of the run flats.