I cannot complain about the Plantronics Explorer 330.  The price was excellent.  It linked the first time with my Treo 755p without any problems. The sound is excellent compared to the Motorola H500 I had before.  Battery Life is good.  Also the people I talk to say that they hear me much better than the H500.  Only thing that keeps me from giving it a 5 star rating is that there is an occasional disconnect between it an my 755p.  I think that it a phone problem due to all the issues I have with this 755p but I do not know for sure yet.