This really is a fantastic product. I've set this up in my kitchen so that when I return home from work and head off to make dinner, I can stick my iPhone on the docking station ready to re-charge (as you may know, these phones don't have a great battery life!). Better still, I can listen to the huge music collection I have on my iPhone, with real good sound quality.
The sound is crystal clear throughout all ranges, and it sounds even better if you position each of the 2 speakers in different corners of the room (yep you guessed it, they're wireless!).
The other good thing about this product is that you can (wirelessly!) stream music from your Windows PC using the usb dongle (supplied). I'm not quite sure how good the range is with that as my PC is in the lounge which backs onto my kitchen. I can confirm though, that the sound quality is no different from when I play music through my docked iPhone.
Being a gadget person, this is one of the best purchases I've made lately. Truly great product, and a great way of complimenting your iPhone - buy one!