I guess you have never picked up one of the Ti ones? If you do you will understand, those things are SUPER light. That is the reason for the Ti, of course
I have not really heard of any performance differences, but I don't follow the barrels that closely, for me the price is really not worth the weight loss.
If you can't handle the weight, work out and get stronger. Or loose weight and make up the difference. Either way you could save $100 onteh differences.