Treo 680 from Cingular

Treo appears to have great features that PalmOS users have come to expect. I bought mine from Cingular the day that they arrived in my local cingular store. I have had to return two of them and am on my third one. The first was locked up and would not toggle between anything. The second one would reboot every time it got a call and the ringer or vibrate would not alert me that a call was even coming in. At the cingular store, one of the staff told me that they had gotten an initial three of them - I returned two of them and another customer returned his for a reboot problem. I love the Treo Products and am hoping that I was just unlucky twice BUT if you can wait to make the purchase it might be a good thing to see what kind of feedback the 680 gets.