Dunlop RFs to Bridgestone Dueler Non RFs- comments, feedback, suggestions?

[Pex5]

We have an 09' X5 4.8 sport with the 20s. At 10k mi. the tread looks about 50% worn. I am inclined to replace the tires in the next 3-4k mi. to preserve them for lease turn in. Has anyone tried the Bridgestone NON run flats? They are the same tread pattern as the OEM run flat Bridges (which come exclusively on the M X5 & X6 Hmmm??)

They are 1/2 the money of the dunlops. And although the Dunlops give an acceptable ride quality (unlike our previous 335xi with the bridge runflats which dislodged a few fillings) my biggest issue with the dunlops - aside from cost - is noise. Any 315 tire is going to be noisy, but I'm assuming that the bridgestone non runflat should ride just a bit better, and be just a tad bit quieter for 1/2 the money.

Has anyone tried the non runflat bridgestones? I've heard the RF version is louder and harsher riding than the Dunlop RFs I have now.

Thanks for any feedback.

DRP