I threw the rear skid onto my d413 for a bit of insurance against hard landings on pavement as I've been using my d413 for a little more parking lot bashing and big-air-getting lately. Great investment for the price and it's been on for 6 or 7 runs now and no issues.
Only issue I had was on installation one of the provided screws would have bottomed out badly. I've attached a photo the middle is stock, the right is provided, and the left is what I ended up using.
But they do mention that not all screw lengths may be correct in their literature, and this is the only time I've found one to be wrong with their products. Overall a great purchase.
Plus no one else makes stuff for the d413! So kudos to TBone!