How noisey are run flats?

[boony]

Just picked up a E60 530d this weekend and now i've driven a few hundred miles I'm beginning to think the road noise I can hear is more than the run flats. It sounds like a wheel bearing could be on the way out? Is the noise normally that bad - I've done a search and there's a lot of people not that happy with the run flats - the noise doesn't bother me too much to be honest, I just want to be sure that's all it is and I don't have a more serious problem.

Great cruiser though.

Cheers all,
Boon

[boony]

Thanks to all for info - much appreciated.

The car is a 54 plate with 98k miles - so no spring chicken. Its the M Sport model too so has the 18" alloys.

Is it easy enough for a mechanic to tell if the bushes are worn & replace them?

The car is on Goodyear tyres - am I better off replacing those with bridgestone ones when they're due or even moving away from run flats altogether?