In reference to the case cover replacement and frame sliders...
Most of us racers do not use frame sliders anymore. Some track day guys and street guys do and proclaim they save stuff. However, every crash that was a lowside that skid off the track had resulted in more damage due to the sliders grabbing than had they not been on there.
Of course, every crash is different and every crash cannot be used as "the same", but in the end, the sliders are a thing of the past for racers. Note the AMA Paddock, WSBK and top shelf race series paddocks. Hell, look at the regional club races and search for sliders... Most will not have them.
As for the case covers, I went with the Woodcraft. The idea that one, the case cover that is on there is not as sturdy and strong/abrasion resistant as the OEM one is why I replaced mine. Also, the Woodcraft ones have the replacement puck you can change out that really assists on the saving of the case cover itself and also helps in saving the other things to a degree like rearsets, etc...
The DP carbon cover is a nice touch and cool. You can also point out that the teams use them. But, when they crash, they replace everything so, it isn't an issue of cost. For a lowly budget racer like myself, it can mean additional costs to where I can safely assume that the Woodcraft piece will last through several crashes most likely. My experience has shown that they last through several and probably could go through more. That cost savings is why we replace them as well as the fact that it saves potential oil loss and internal damage that can occur in a crash on that side...