| I've always been suspicious of crash bungs, having seen the damage they can do to engine mountings, etc. on race bikes.
I'm especially suspicious of use of them on a bike like a Ducati with a triangulated trellis steel frame. These frames are designed to be extremely strong longitudinally, but laterally, they are not strong at all, and I for one would never fit something that would concentrate any lateral force on one point.
From my experience of lowsides (the thing you're really trying to guard against with crash bungs), the 748/916/996/998 crashes very well, given its narrow profile. Personally, I think it's worthwhile spending money on:
1. Good, thick, self-coloured fibreglass bodywork, from vendors like ARD Racing in Newcastle
2. Strong clutch cover, like the type sold by Casoli Moto
3. Spare Water Pump Housings
All of these things will cost a whole lot less than a bent frame if your crash bung catches a kerb. | 
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