Dynamat vs Fatmat vs Eastwood Thermocoustic.....sound deadening expierence needed

[Nicks67GTO]

Im looking at sound deadening my 67' GTO the spring. Im looking at Eastwood Thermocoustic, Dynamat, and Fatmat. Dynamat seems awfully proud of their product at almost twice as much as the Fatmat and Eastwood has some pretty poor reviews with heat related issues etc. Im just wondering who on here has used these products and if you were satisfied with the products? Is dynamat worth the extra $$? I know its the industry standard and Ill pay the extra $ if it really truly is that much better but I hate to toss $ out the window like that. Also when i do this should I just do the floor or should I do the door panels, roof, etc?