I'm on my second month with a Treo600. I love having one pocketable device, instead of a separate phone and PDA. To use both at once, you can go into speakerphone mode or a headset. Surfing the web is do-able, but it's best done infrequently. I have used my Treo to check flight status online, to get a map from Mapquest and Google. The 600 has been surpassed by the 650 that has bluetooth and a much better camera. The 600's camera is pretty dreadful.