[Galaxy S 4 Accessories] killerz298:
Sharp, you have the same dock as I received. I can tell from the look of it and the instruction book. Please see my issues below and let me know if you have the same problem.

I ended up buying the dock from an Amazon seller. It is the same exact dock as I originally posted. I am having an issue with the dock right now and am working with the company. I will update you when I have more info.

Some initial impressions:

I am using the dock without a case on the phone. There is a spacer on the dock you can remove so I think most thin cases shouldn't have an issue fitting. When just the power is connected the phone does NOT go into dock mode (if this is important to you). I have it connected to a wall outlet and not by USB to a computer so I don't know if that makes a difference. I will test it out tomorrow. However, this might be solved by plugging an audio connector into the dock as explained below. I think there are also apps which can force dock mode when connected to power anyway. However, the dock DOES charge both the phone and spare battery without issue. The phone is pretty stable in the dock and I can text while the phone is in the dock without knocking it over (as long as I am gentle with it). I would like a little more bottom weight to the unit but it is acceptable. Inserting and taking the phone out of the dock is currently a 2 hand operation. I will try to see if I can come up with a way to do it with one hand but the phone locks into the dock pretty tight. It is difficult to get the spare battery into the slot. There is a little tab in there that pushes in when you put the battery in. I don't know what the purpose is as the slot is pretty tight fit as it is. If you try to push the battery straight down it will not go in. You have to angle it in from the charging side which pushes the tab in and then push down and it will go in. Once you figure out this method it is easy to do.

Now on to the problem. When I took the dock to my office, where I will mainly be using it, I connected both the audio cable and the power cable to the dock and slid my phone in and I got nothing. No charging, no audio, nothing. I checked all the connections pulled them in and out as well as the phone but I still go nothing. I tried just the power and it worked fine as stated above. As soon as I plug the audio cable in the dock stopped charging. I tried just the audio and that worked fine without issue and the phone DID go into dock mode when the audio cable was connected. It played audio fine through my speakers and all was well. However, when I plugged the power cable back into the dock .... you guessed it... audio stopped playing and no charging.

I take it I received a defective unit. It IS a cheap piece of crap from China so it is bound to happen. Perhaps I am having an issue because I am connected to a wall outlet instead of a computer? The company is very willing to work with me and are quick to reply to email. From their first response they seemed puzzled at this operation so I assume that this isn't normal operating procedure. I assume they will send me a new unit and when it arrives I will let you know how it goes. If the new one functions with both the audio and power plugged in I would absolutely recommend this dock.