I wanted a device that could be used as aPDA (TODOs, Calendar, Note Taker)Music Player while commutingPhoneroughly in that order of importance. I've used this device every day for 2 months now, and after a bit of tweaking, I've found the Treo to be a brilliant device that does all of these things and more.One word of warning. The Treo 650 is *not* a usable device out of the box. It requires configuration changes and installation of 3rd party applications before it becomes usable. Add $50 to the cost of the phone for the extra software and gadgetry you will need to buy to make this thing work.Phone: Works great after you 1) Buy "VolumeCare" so you can actually hear the person you are talking to and 2) Switch off the touchscreen while using the phone so you don't keep hanging up the phone with your ear! I only use the phone a few times a day and am not a power user but I actually find it a better phone than the Nokia I used to have.Music Player: The Treo 650 is a good, but not a *great* music player. It's OK, but if you are a music freak who listens to music everywhere they go you will want something better than this. For me it's great for listening for 5 minutes while I'm waiting for the bus or whatever.You will need to buy an application called "pTunes"; the music player that comes with the Treo is *very* basic. The headphone jack is the wrong size, so you will need to buy a convertor. There is some kind of problem with the jack that makes it crackel every now and then. Little annoyances like that. You will also have to buy an SD card to store your music.PDA: The first PDA I've owned, and it works great for me. It's also great for GTD (Getting Things Done). I'm much more on the ball now my calendar and next actions are in my pocket everywhere I go.As you can see, the Treo 650 requires some effort on the part of the user. If you are looking for something that "just works", or you are ultra busy and can't afford the time to sit down and get it working, then this is not the phone for you.On the flip side, this is also the strength of the Treo. *Every* problem you encounter has been fixed by someone somewhere. Don't like the calendar that comes with the Treo? Download and install a different one. Music player no good? Install a better one. It's awesome. Every other gadget I have has flaws I wish could be fixed, but the only way is to buy a new device. Not so with the Treo.One more thing. My Treo is extremely stable and I've never had a problem with it crashing (except for some 3rd party apps I've tried). The newer firmware has fixed all the previous problems with stability.If you use Linux (like I do), you'll find it integrates seamlessly with the Treo. Using KPilot, all my contacts and calendar are now available on my laptop as well as the Treo. Handy.The Treo is bigger than your usual mobile phone, but is still small enough to easily carry around in your pocket (it's about half the size of my wallet for example).Highly recommended.