I've had the R&G style 'slider's on my 748R.
My experience of them is to not bother. Ducati's of the 748/916/996/998 family crash pretty well (in a 'low-side' crash that is). If you have a strengthened clutch cover and water pump cover then you have to be pretty unlucky to do a real load of damage.
Most of the 'sliders' as you call them stateside, made for Ducati's involve replacing the main engine moutning bolt with an aftermarked item that the sliders attach to or clamping brackets around the trellis frame.
In both cases, these items make the trellis frame the main support area for the sliders and thus the main focal point for any impacts following an 'off'.
In my 'off' during a trackday last year on the 748 and my friend's off on his 916RS during a race, both our bikes slid on their sides across the track surface. On most tracks, the edge of the asphalt surface on bends is surrounded by 1/2-2 inch raised kerbing.
It doesn't take an Einstein to imagine whats the first thing that hits this kerb when your bikes scraping across the surface on it's sliders (mounted directly to the trellis frame as they are).
In both our cases, the slider was wrenched sideways and this bent the replacement engine bolt which has nowhere to go. Taking the stress of this impact is the frame lug that the engine bolt passes through. In both our cases this lug was bent/elongated by the bolts tryign to move sideways.
This required that the bikes were stripped and the frames jigged and the damaged lugs cut out and replaced.
Think what may have happend had the bike been airbourne and landed on it's side from 18 inches in the air straight on the slider.
In my view and based on my experience, I'd rather face replacing a set of $200 track bodywork than a $2000 frame.
Here's some pics of the design I'm talking about.