I have been using the Sony SRS-XE300 for about 6 weeks now and have been delighted with its qualities.
It has performed brilliantly in a variety of settings, lounge, large church hall with poor acoustics. I havent used it outside yet.
I have been impressed with the clarity of the music with its solid bass line. The volume is remarkable and able to fill a large room with ease. The sound is very evenly distributed across the room.
Setting up to both an iPhone and iPad was very straight forward with excellent Bluetooth connectivity.
The shape of the speaker is unusual - pentagonal and stands about 12 inches tall. It has a very solid feel to it, weighing about 2.5 lbs. There is no handle so it is not so easily carried although it can fit in one hand comfortably - I have large hands though.
The battery life is superb with no concerns that it might fail in the middle of a session.
All in all a great speaker with great sound and versatility.