I have the Sonic Impact I-F3. It was great when it worked, good sound, convenience, but then the battery stopped holding a charge. No problem, just go to the website and order a replacement battery. Guess what. They don't have replacement batteries. Oh, and read this, direct from their website"SI5.COM is committed to educating our visitors. A great customer is an informed customer. To allow the most time to create quality websites we do not have any way for visitors to contact us."What the hell? If that is a case of doublespeak. Buy it if you must, but don't expect any support from Sonic Impact.