Those things are obnoxiously loud (which can be good) but the sound quality is not that great IMO. You can get a Delkavic or LV cheaper and have better sound.
It's your bike your choice, just letting you know you have options for low priced slip on exhaust.
You ever see that Honda Civic hatchback that has a hole in his muffler but he rocks it high RPM like it's cool? That's what comes to mind when I hear the Growler. It's loud but doesn't give the impression of performance. Just loud for no reason. Someone here referred to it as ghetto and I didn't get it but now I do.