I dont know what or who Oliver Drab is but as for knock off gear, buyer beware... you get what you pay for, even if it is $288.
As for the "du pont" cordura they dont specify if it is urethane backed or not and thought the stitching is probly legit the other materials (webbing and edge tape) are sub standard and will wear out. That being said guarder make some of the best copies of real gear out there, but it is cheap for a reason. I did notice that they changed a few of the designs from the praclete RAV, and I hope it is worth it. I would honestly stick to chest rigs versus armor carriers for AZ but to each their own.
If you did go with one I would go with OD (oliver drab), woodland is hard to re-sell.