Yep, there is a difference, for sure. I purchased my first omniGRIP ruler a couple weeks ago and I almost cried there was such a difference. The urge to cry mainly because over the last two years or so I have invested in many (maaaaannnnnnyyyy) omniGRID rulers. My main complaint with them was the slipping. As soon as I tried the omnigrip, I thought "oh no!!!, now I have to give all those slippy omnigrids away and start replacing them with the grip kind.
BUT WAIT!!!! After lamenting over this dilemma for a couple of days and even putting all my omnigrid rulers in the goodwill pile, I came up with a solution. I put a small dot of hot glue in each corner (on the down side of the ruler) and smoothed it pretty flat while it was hot and I can.NOT believe the difference!!
and as you can see from this next dot, it doesn't have to be perfect, just small and relatively flat
So out of the Goodwill pile came all my rulers, redeemed by a few dots of hot glue. I even did this with all my "special" shaped acrylic templates and it works great!