Sometimes they work OK others times not and ensure you know which way up/down you require the adapter to go (90' vs. 270') as some TV's have 'upside down' or side mount HDMI sockets, ensure the shape of the TV allows you to fit a fixed angle adapter and ensure it will not foul the bracket you plan to use.
Another option is to use a short and very flexible HDMI Male to Female cable - we find these less problematic.
Yep. Somebody posted the same thing over on AVSForums (maybe the same poster with a different handle) and my response was pretty much the same. Certainly hits all the marketing buzz words but if it works, then that's the cable for him.