One word... GASH! I've had numerous cars and lots of tires from low/budget, mid range and high performance. On the BMW these are utter nonsense for a tire that can cost nigh on ?300 each.
The skip, crash and bounce all over the place, traction control light comes on when going over minor indentations in the road, the have as much grip as as an arthritic chimp, even worse in the wet.
Unfortunately, these come as standard on new BMs so I didn't actually pay for them directly. They'll be consigned to the heap soon for a proper set of tires, ie Eagle F1s or P-Zeros.
If you value you safety and your wallet, then AVOID these like an episode of the X-Factor!!!