Originally Posted by supcom
...The weight savings are nothing compared to the total weight of you plus the bike...
I didn't buy the saddles for weight savings - I bought them to try the shapes and see if they were comfortable. I deliberately avoid ultra-light parts on my bike (and will continue to do so even if I get down to my target weight of 225). If I could buy similar saddles in a "heavy-duty" configuration, I'd do so. Unfortunately, saddle makers make their "better" saddles with titanium rails!
Obviously, there is no consensus on this question - some say contact the manufacturers, some say no problem, and some say I have a death wish.
The prudent course seems to be: Contact the manufacturers - if they say OK, then ride. Otherwise, buy a steel-rail saddle.