I've had my bed sport bar on for a couple months now. I really like it. I have noticed the rattle up top but yeah it can easily be fixed as stated earlier. The way it bolts up you can tell it is definitely just for decoration. You can tell by the weight of it alone. But I am super impressed with the quality of it and the finish.
Still putting off buying a bed cover to accommodate the bar but it has been done and several covers will work. I also don't notice much of a blind spot because the rear headrests are usually there anyway and the tint doesn't help anyway. Never relied on that view out of the back windows anyway.