| UncleD.
I had an off at Croft on my 748R with the thru-the-frame style bungs. Whilst they are good for sliding if you don't hit anything, that is rather unlikely in most 'off' environments (unless of course, Bruntingthorpe is your favourite "ditching it" location).
See the below pics for the reason they're not that good. The images show what happens when you hit something with the bike on it's side. That something is normally a ramped kerb on the trackside before your pride and joy is launched onto the grass or into the gravel.
Main thing to consider is NOT "Oh that bolt is only a few quid to replace".....it's more like what part of the bike is immediately before the part where the bolt failed. If you think like that then you'll realise it's the main frame lug for the engine mount. In both my off and Felix's (who also had this design of bung) fairly severe damage was done to the frame lug by the bar being forced in a sideways direction by the initial impact with the trackside kerb. In Felix's case this required complete removal and replacement of the frame lug.
Just my two-penneth  | 
Guido
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