I love the 1/2" on the side of the Omnigrid rulers. Here's why: when you are measuring an even increment of inches, it is ever so much easier to line up along the 1/2" mark than at the 1". There are fewer lines and it's easier to see if you're exactly on the mark. For 1.5", I use the "even inch" side, thereby landing again in the middle of the marks and not on the even inch. I spin the ruler around often, but it's easily done,
charlotte, hoping this makes sense