Well i used to be a fan of this "Pump them up so they wont pop" attitude, until i tried lower pressures. I always used to like them, but used high pressures for pinch protection. Anywho, i thuogh i'd give it a go, so i bought a hutchinson DH tube to try, in my megablaster, at about 27psi (30 to be sure of getting no pinches :D ). Anywho, i ain't going back now - my bike feels just as i like it, and my riding's improved (especially gaps - maybe unrelated though :wacko: ).
I reckon everyone should at least give this setup a go, even the weight freaks (i went from hot S + latex tube to this setup - adds a fair bit of weight - about a pound, if not more), and if you like it, there's no going back :-
Oh the tube weighs 350g (i weighed it).