I have the E450 soundbar and a new Samsung 46" LED HDTV with ARC capability.
So far I've not been able to get the E450 power on when I turn on the TV (apparently a very common problem). My solution was to add SPPWR button to my MX-500 universal remotes (we have three of them). But no problem controlling speaker volume with the TV remote, nor just letting the speakers shut down automatically.
FWIW I have both the optical audio and HDMI cables connected.
Except for the power on oddity, the E450 is a huge improvement in sound. Being deaf in one ear the 3D effects are lost on me; but my wife likes them
BUT -- one odd thing: While the Blue Link light on the subwoofer is illuminated, there appears to be a power LED next to it which is not. Is this a common issue or do I have a defect?