Spectracide Weed Stop for Lawns - Weed Killer Ground Ivy, Wild Violet, Clover

Spectracide Weed Stop for Lawns - Weed Killer Ground Ivy, Wild Violet, Clover
How effective is this weed killer and post emergent for lawns. I've always liked Spectracide weed killer, but sometimes it can take two applications, however, I like to mix it just a little stronger than recommended, and apply on a calm day, less wind and during optimal conditions.