I got this to listen to quiet music at night while reading, and also to run my sleep machine apps.
This this looks great, has a small footprint, and charges the phone 4 nicely while I sleep.
There is a specific music player app you can get for free to go with it, but it works with the stock music player on my iPhone 4 and all the sleep machine apps I use, as well as inTune Radio for internet streaming stations.
I pumped up some dance music to see what the sound quality was like and it wasn't bad at all for a product of this cost, and size.
Included carry case is handy, as is the ability to put batteries in and use it without having to plug it in.
Does look nice too, but haven't given it 5 stars due to the lack of a volume remote control, but considering it is actually on my bedside table that is a really lazy thing to mark it down for, but I am doing it anyway :)