I found out the hard way what ECS means on the exmark wb. Enhanced Crash Syndrome. I was mowing along near 4th or 5th speed, deck set low on the second pin hole, when the deck found a root. Not a large, monster root you might expect to stop a wb, but a root protruding about 1 inch out of the ground. The deck must have caught it just right and stopped the mower dead in its tracks. The ECS is much improved over the older pistol grips. When my pelvic bone thing above my you know what hit the handle bar, i saw stars. Pain, but not as much as the old pistol grip had caused in a similar situation a few years ago. Thanks exmark for the rounded bar and not the pointed one!