I pull people out of mangled cars with far too frequent regularity. 99 times out of 100, if you are in an incident that is bad enough to necessitate self-extrication via a window, one of two things has also happened. First, the windows will already be gone- no need to break them. Or, second, unconsciousness will make self-extrication impossible.
Another thing to consider is the necessity of self-extrication. Sure, if your car is on fire, sinking to the bottom of the sea, or teetering on the edge of the Grand Canyon then, sure, get out! But if none of these environmental threats exist, you are jeopardizing yourself- or whoever it is that you are trying to Ricky Rescue. Think about it- the vehicle in question just sustained enough damage to render the doors inoperable. Even with a seatbelt and airbags, occupants of the vehicle will have sustained some damage as well. What if that damage is to the spine and wiggling around is the last wiggling you do? Will shimmying, or being yanked, out a window exacerbate internal bleeding?
It is definately a cool tool- I enjoyed the one time that I used it- 6 years ago?, but I think that there are negative consiquences that are rarely considered with its use.