I have mine in true wireless 9.5 meters apart. Only seldom i get any real stutter but not sure if this is due to my source or the wireless connection. I have an iPhone so don't want them connected with Bluetooth as the iPhone does not have aptx=lack of sound quality. To solve this I bought a raspberry pi and programmed this one to act as an airplay server (30£)(airplay is wifi losses audio, compared to aptx not a major benifit else than that airplay buffers two seconds sound in the network, but compared to regular Bluetooth audio this is a real big sound quality improvement for iphoje/Ipad etc.). The trick is here that one can connect the raspberry pi to the left speaker with the USB in. Hence it is possible to run them in true wireless with airplay. This is not possible for example with an airport as this only has audio like out, and the s3 does not support true wireless with line in!
This works very good.
And after 1 week I am very happy with them. My living room is close to 50m2 and the sound is still very good for ambience and soft listening to music, even with having them put the speaker pair this far away which is far from optimal.
Very happy buy, and works well with the USB in jack!