After receiving the dock, and fitting it all together, before I even used it in the car I could feel the quality of the build. The dock has a nice feel of quality and heftiness. The tight fit of the phone in the dock is very good, there is no chance of the phone falling out or coming loose. I also have the official samsung galaxy sII mesh case for the phone which does fit with the dock, but the slight added bulk of the case means the grip on the phone is very tight. This could be a problem for some when fitting/removing the phone. Use with other cases seems to be impossible. Those who don't want the hassle of removing their case every time they use the dock should probably decide on a different dock.
Another aspect of the official dock is that the car charger is that this official charger is slightly more powerful than other similar car docks you will see around, enough to mean that even when using the sat-nav feature the phone will still be increasing the battery charge, whereas other cheaper docks the phone even when being charged slightly loses its charge when using the sat-nav feature.
The speech recognition, which automatically enables itself when plugged into the dock, seems to be quick and accurate the occasional times I have had the chance to use it, but does sometimes have the habit of repeatedly asking "what would you like to do?".
The dock also has an audio jack as well as the charger, so you can listen to your music if your car and an aux port.
Overall this dock is a solid piece of kit which performs its job well, but it does have a few minor faults. It is expensive, more so than other docks you can buy, but definitely worth the money.