i have the presion meters in a Kinze 2600 along with the 20/20 monitor ( a kinze 2600 is basically a john deere 7000 in a blue shirt).... i love it. i have a friend who has a vac with the 20/20... his spacing is better then mine... but i basically did not want to go to a vac.... with a properly maintained planter (chains, drive, meters, graphite, meter adjustment) i can plant usually within 1-2% of him.... with varying seed sizes and without a 20/20 monitor your probably not planting anywhere what you'd really want to once you saw what the monitor showed