... there are other tools that work just as good, if not better, for half or even less then the price of this.

Plain and simple this is a great roller, the rubber head doesn't cut or tear into the foil backing of the sound deadening mat and really helps you put good even pressure to hard to reach areas. That and it saves wear and tear on your hands.

But like I said there are cheaper alternatives like a super cheap wallpaper seam roller (you can find some with a rubber or wooden roller) or my personal favorite a "J" roller. With the J roller you can use the roller or even the curved handle to apply pressure to the sound deadening mat. You can even use old roller skate/blade wheels.

So to recap:
Great tool
Saves your hands from a ton of wear and tear
Works great
BUT other tools/items can be had that do the same thing for much less.

The dynamat roller made installing my dynamat xtreme much easier. You can even use the handle of the roller to push the material into crevacises and really smooth out pieces along edges. I probably used the handle more on the doors than the roller itself. The roller is a nice soft rubber, so it really adapts to the surface and applies good pressure to the dynamat.

I recommend wearing some sort of gloves though with this tool. After 12 straight hours of installation, my fingers had some pretty painful blisters. The wooden roller probably works well too, but I had a lot of surface contours on my car, so I choose the softer roller.