I just installed the TT skid plate. Note that the TT one attaches to the frame via brackets under the foot pegs where the KTM bolts to the case in the back. The TT is also steel as opposed to aluminum and as such is probably 3x's the weight. It is also very flat on the bottom which might prove to be convenient, not sure yet on that. I did not like attaching to the case is what really drove my decision.
2008 Yamaha WR250R
2011 Husaberg FE570S