I would like to see a side by side comparison with this -and all the others-with the stock cover.
I know of at least 4 front axles that were destroyed and repaired and although repaired, were never quite the same and eventually needed replaced.
I killed a front HP 44 and cracked the diff casting on the long side that the tube presses into in a sub 15 mph collision with a rock that stopped the rig cold. It hit on the lower corner of the diff.
I killed a Currie HP 9" housing and broke the axle tube in half through the weld where it attaches to the pumpkin. I repaired it and a few years later did it again.
I have been on the trail with 2 others in similar fashion.
What I learned from all that was if you need a diff cover that strong to protect your ring gear from damage, it really won't matter because the impact will ruin something else.
Pay attention to the HP 9 comments, I ruined that housing with no thicker than the equivalent of a 3/16" thick diff cover.
I ruined the HP 44 with a Barnett cover in place.
The others I've seen were not running heavy cast covers due to clearance issues. Just a Barnett or similar. That and I don't know of a single incident were the caving in of the stock cover ruined anything. The worst that will happen is you wear a hole in the cover from the ring gear spinning against it. But, anyone who has worked steel with a hammer knows that it is very hard to beat steel over against something and have it stay tight to it without heat.