I woulnd't.

Watch for any stress marks appearing on them, but they're pretty damn tough!

I keep thinking this, that I may as well save 700g odd on my DH bike by putting XTs on rather than the RaceFace DH jobbies that came stock....

As for the SDG Bel Air saddles, they aren't really that light, a WTB Devo Ti railed jobbie is a lot lighter, like 100g so with the claimed manufacturer weights. 

Also, this thread on descent world may be worth a look for weight saving ideas:

http://www.descent-world.co.uk/forum/index.php/topic,48933.0.html 

Smack him Dan, bloody snot nosed southern student types!

yeah, I should Gggggrrrr

*thinks*

am also from darn sarf, was also a student