I gave mine a 300km run today and found them good on both dry bitumen and at speed on loose gravel where they tracked well and didn't throw stones under the guards.
Edit: Judging by slight scuffing on the thicker upper sidewalls of 2 tyres it appears that they found a few rocks to rub against on the drive around the tracks on Galore Hill reserve near Lockhart. The thicker section more than covers the ground side of the sidewall bulge.

