How many can say that their bike fell over with sliders, and no damage was done to the bike other than the impact marks on the slider itself? Likely no one.
From what I see here, most are very particular about their bike. Even a small scratch means a new fairing.
As mentioned above, let a slider bite the road with a little speed, and the bike is flipped over, or flipping multiple times.
This always results in more damage than a lowside slide(unless there's a hard sudden stop that kills the bike anyway).
No one can predict what will happen in any crash, so I don't think that there can be a right or wrong answer.
You either want them on your bike or you don't.
The B-King I recently got came with some heavy duty frame mounted sliders(Puig I think). Given the mounting point and lengths of both, I can see them saving the engine from impact in a fall(it also sits higher than the Busa).
I personally hate sliders and I have never nor will I ever buy them(they remind me of training wheels
), but I have that feeling that as soon as I take them off, the bike will fall over and break something expensive that's needed to ride(scratches don't bother me).
I'de base it on looks, you either like the looks of them or you don't. Because they can help out in a crash, or help total the bike.