When you buy a pair of passive speakers you tend to set your expectations on the low side, these little speakers from sony ericsson however do work very well and are very well built.
The sound is not just loud, but clear too ... very acceptable for the price & the phones own equalizer helps to balance the sound and the radio works fine.
I would have given 5 stars but for a couple of points ... the first being the fact that the sony ericsson socket on the speakers will not fit the headphone slot on my sony ericsson desk charger ... that is down to the physical size of the socket casing and the slight recess on the desk charger. This means that you cannot charge and listen at the same time.
The second minor irritation is that whilst the speakers have a aux socket enabling you to use other mp3s etc, you MUST have your phone plugged in and powered up for the speakers to work. It would have been useful to have been supplied with a line-out lead too. An important thing to note is that the speakers will only run off sony ericsson phones; if you change to a different make or SE move towards mini usb, it will limit the useful life of the speakers.
I must stress that these are minor points and I would have no problem in recommending them.