I used sliders on 2 bikes: Speed Triple and CBR250R.
Both were 'tested' in 0 mph tip over incidents and they did a good job keeping things from damage.
I was going to get sliders for the ZX-14, but then I read about a bike that was 'totalled' in a low speed slide because a frame slider bent/broke the frame that it was mounted on.
Because of that, the ZX-14 gets no sliders (and of course there are no crash bars)..
Replacing bodywork is cheaper than a ruined frame (which should NOT be 'straightened' or rewelded IMHO).
For the CB1100 I chose the Honda crashbars.
Some have preferred a bar with more bracing to make the crashbar more rigid, but I tend to regard the crashbar as being like the expanded poly in a helmet: it is MEANT to be crushed in order to save the head.. So I prefer a 'weaker' crashbar that will deform on impacts and thus absorb the shock, rather than a braced crashbar that might transmit more of the shock to the motorcycle..
It doesn't hurt that they look really nice too