Brad, what year is your Windrider?
As far as mesh is concerned, there is the Windrider SW that uses dyneema gridstop.
The 2012 versions of the Windrider added the thicker, much stiffer stays from the Porter models, pre-shaped but can be bent. Increased padded on the shoulder straps and belt. A wider belt (4" at the widest).
My concern with the Gorilla would be the suspect consistence in construction quality. Some are being made with shoulder straps that are attached to the main bag much too close, causing chaffing and carry comfort issues.