I was so excited to hear about the features of the Treo and that it was compatible with my Sprint service that I ran out and bought one soon after the 600 came out. It definitely does have all the features I want and need. I absolutely love the ability to get to the web and to sync with my computer at work so that I can have access to my calendar, phone list, etc. And it is especially nice that I don't have to carry both a phone and a PDA. I enjoy the bells and whistles. But the Treo 600 has (what I consider to be) some design flaws that are so irritating to me that I am considering replacing it or going back to carring both a phone and PDA.First, I am over 40 and the letters are that keyboard are difficult to read, especially in the dark. And much as I have practiced, I cannot seem to get the hang of holding the Treo and using my thumbs to type as I see younger people do.Next, when being used as a phone, the Treo is not designed to fit eaily in the hand and to hold to the ear. I seems I am always having to adjust where I hold it in order to hear the caller. Women will find that using the phone at the ear will result in smears of makeup on the screen.I had voice command with my older cheaper phone-only cell phone and I loved it. But with the Treo, it takes two steps to get to the voice command feature and any safety offered (during driving, for instance) by dial-less calling is counteracted by having to look at the phone and press two buttons to get to the point of voice activation.The touch screen does not seem very responsive, especially toward the bottom of the window.Web access, while doable, can be very time-consuming.Maybe it's just me. Perhaps I need some 20-something or 30-something to train me how to get the most from this phone!