I purchased an ASR Tactical Zirconia Ceramic Razor from eBay for an escape video I was planning to make, that video is still to come, but here is a review of the product.
All in all, the razor works. What I left out of the video, was that it claims not to get dull, and it may for that reason be more useful in a survival kit of some sort than a traditional metal razor. But the size and shape make it difficult to work with. It is easy to lose your grip, which can lead to cutting yourself, or losing the razor especially in an outdoor type of situation. You certainly wouldn’t want to use it to escape from zipties, because it is difficult to put enough force behind the tool when it is in front of your face, much less when your hands are tied behind your back.
If you want a sharp object that will get through a metal detector and patdown, this is the tool for you. But other than that, I’m not sure how useful it really is.