I too haven't seen this ruler however my DH has been a flooring installer for about a million years and he uses steel rulers with his olfa knives and I've "borrowed" his curvy ruler without any worries.

But, if you're cutting strips, how do you see how wide to cut them?? I guess you could use the markings on your cutting mat..... I've never see a ruler like this used for fabric...

that's what I was thinking too. Wouldn't this limit what you can cut??? Is it heavy?

It seems it would require you to use the lines on your cutting mat for measuring the cut, rather than the ruler. Maybe OK for some uses (like the long cuts in a fabric store, which are measured on the mat anyway). But I can't see it for home use - at least not for fabric. Looks perfect for cutting drywall :)

We use similar steel rulers at work with big electric cutters and cut thousands of yards of material.
peace

I tried it once and didnt like it. It's not clear and I like to see that nothing shifted.

I've got one for cutting mat board for photos. I wouldn't use it for fabric.

Not being able to see through it; having the rotary cutter blade go over metal, and the weight of the metal (no matter the length) would all be a problem for me. I can't see any advantage to it at all.

Well, looking it at the prices, it appears to be more expensive than an omnigrid ruler, without the ability to see through it and line up perpendicular lines and see the marking the whole way along the fabric, so I'm not sure what would be worth the extra price.

Its not see through. I count on mine being see through. I do like the idea of having your resting hand behind that shield.