First, I got a V400.. returned for another in 5 months, and then another and finally Cingular offered me this phone (v551) as a free replacement.Problem 1: I requested the Cingular salesperson to transfer contacts from the older v400 to the new phone.. most of the contacts didn't make it. (tip: use the SIM to store contacts instead of on phone)Problem 2: It is mandatory to search by the first letter only.. unlike the Nokia phones where you can search contacts by the first combination of letters.Problem 3: The bluetooth transfer is very slowProblem 4: Your settings, notes, can automatically disappear / reset when your phone is turned off -> on.One advantage I find is the ability to send DTMF tones with the calls, that saves me time while using calling cards for international calls. Another is the design.. I don't even have to bother if I drop the phone (5ft high on to a concrete floor).. it is rock solid and keeps working in spite of repeated drops.. Call quality is good except in elevators.