I replaced the OEM Grabbers on my wife's 99 ML320 at 34k miles with Pirelli Scorpions. A friend of mine has just done the same on his 99 ML320.

The tread pattern is really good in the wet and they run quieter than the OEM Grabbers. They also seem to have a slightly stiffer sidewall which has imoroved the handling. Can't give you any info on wear patterns because they are still only 2k miles old.

99ML320
98 RR 4.0