dynamat for A Body tell me about yours...

I am looking for some ideas if you have used Dynamat or something like it in your car.

I am trying to find out... what you used and if you would recommend it.
How many feet you needed to complete the job.
Some gotchas I should be aware of for installing in my car.
If you used the dynamat roller to apply. ..
Any photos of what you did..

Thanks,

Craig