I use one of these docks every night. Its legit and should have been what the OEM dock is. Its perfect for the price and doesn't affect my battery at all. Worth every penny
The only downside is that it's all plastic and the blue led light is kinda dim as opposed to the OEM one that is usually offered here in NA. Other than that, as previously stated, it's a very convenient dock and looks much more fitting that the OEM. I ordered one from Hong Kong myself and it did take about 2 weeks to get. Kinda works in your favor, because by the time you receive it, you almost forget about it and then when you open the package, it's a nice surprise.
I have been using one of those for two months and like it so much that I ordered another one.
My phone sits perfectly on it and it goes into bedside mode when on it, just like with an OEM one.