Originally Posted by TennezSport
Well I have actually held D3O in my hands and I can tell you that it is a reactive material. It's in the way the fibers line up, so if you slowly or gently press the material it will bend. However, if you strike it hard the fibers realign and make the substance rock solid; not so James Bond. Like it or not it does work. Most of the new materials manufacturers use do work as stated, although may not at the levels of advertizing.
The bigger problem is in the way rec players look for racquets. If you have a racquet for 5+ years and you play frequently, your racquet has gone soft over time and you have become accustomed to the softer feel (especially if the racquets have heavy wear in the frame from scrapes). So, when you go to buy a new racquet, even the same exact model, you feel that the racquets dont feel the same. We see this all the time and show customers by measuring and comparing the flex of the old and new racquets. They had no idea how soft their old racquet had gotten.
The comments about lighter frames are correct and NO Pro plays with a light frame. ALL Pros play with customized frames.
I guess that's my biggest problems with these advertising. Just how much of this stuff is in the actual racquet? Like you said in your case, "D3O" does work, but how much of it is in the frame? Head doesn't release the % composition, it's entirely possible that manufacturers use the bare minimum just so they can put the sticker on the frame. Is the bare minimum significant enough make a difference, or is it negligible?
And in some cases, it's just false advertising, such as Babolat's Cortex system.