for the love of all good things you guys don't know jack. This guy above is the only one in this thread who knows his stuff.
MOST demo bindings only weigh a few grams more than regular bindings! "OMG! DEMOS ARE LIKE CINDERBLOCKS ON MY SKIS!" not really. Comparatively, the s912 ti regular is 990 grams and the demo s912 ti is 1000. Whoa! 10 grams!!!...
Okay, sarcasm aside. Most demo bindings nowadays don't weigh much more. The benefits of a demo binding are obvious. The downside is the usually the connection. Let's face it, if a binding can slide forward and backwards on both the toe and heelpiece than the connection isn't that solid. So, if you are heavier skier who goes big, you have a good chance of breaking a demo binding. However, if you weigh less than 150 lbs, why not use a demo binding? You aren't going to break it unless you are hitting a 90 foot table and bail, and then the bindings are the least of your worry...