I thought you gave a very good review but the overall premise that these type of jeans actually give good protection is in dispute. Everyone knows that denim is very good at soaking up blood but it unfortunately offers very little real protection except on very smooth surfaces where it can slide without snagging. The protection that the kelvar used in these jeans provides is also in dispute. I attended a seminar several years ago hosted by Wayne Boyer, owner of Cycleport, and he said that kelvar has to be woven in order to provide abrasion and tear resistance and the kelvar used in these type of jeans is a cheap imitiation. The stretch kelvar Cycleport uses in their products is imported from Europe and costs $70 a yard (at that time). I have a pair of older dragging jeans that I sometimes use for quick trips to the store but I don't think they give a fraction of the protection that the Cycleport pants provide.
If you aren't familiar with Cycleport, take a look at:
https://www.motoport.com/index.php?option=com_content&view=article&id=10:save-your-hide-guide&catid=1:articles&Itemid=22