Are dynomax super turbo mufflers worth the cost?

I like them better than the flowmaster delta flow 50s I had but I'm still experimenting. Back when I was shopping mufflers, I remember there is a you tube video where they try out all the dynoflow mufflers on a engine (but I think it was a chebby) and sounded good. I think it was filmed at a car show and they swapped one muffler after another by slipping it on the pipes/headers sticking straight up in the air. You might have seen it already..if you haven't enter this in the you tube search and it's the first video..
Live Dynomax Muffler Demonstration - Hear them run!