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My Spa saddle's rail snapped a while back, after about six months of being used daily with the carradice rack.
I think the rack contributed to the snapping, but I suspect that it was much more to do with the fact that I had the clamp too far forward...
however it did make me think that these kind of racks - as convenient as they are - really shouldn't be used for regular, heavy loads.
To avoid the hassle of the buckle-unbuckle twice a day, I use this bag support for commuting - which was first around in the 50s-60s but has just been re-manufactured and re-introduced:
http://www.carradice.co.uk/index.php?page_id=product&under=range&product_id=136
It's fine for normal loads, but anything heavy puts quite a strain on the saddle rails, so I wouldn't load up with more than 2 boules at a time.
edit: just scrolled back and realised everyone knows about this already. sorry