I have ordered a good piece to my iPhone 5 to use the iPhone 4S on the dock. And I must say, it does the job. It stuck, does not wobble, and also the iPhone sits bombproof. To my surprise, I have to admit.
Playback continues smoothly. Charging as well. I have a station of Sony and no Kompatibilätsprobleme.
Of course I would have preferred not to have to resort to an adapter, but before I replace the stations, I buy he prefers this part. I would highly recommend it.