When I first used the Treo700WX, I was enamored with its features. Afterall, it had all the prerequisite features such as bluetooth, EVDO speed, internet, camera, etc. More impressively, I was able to install the killer app "Sling Player" on the phone which allowed me to watch my home TV anywhere I had cell phone connectivity. Unfortunately, the more I used the phone, I discovered that the features it was lacking became frustratingly painful.
Here are the items that keep this from being a GREAT phone.
Phone supports "Voice Dialing" using windows mobile software, however, it does not work through the bluetooth connection -- which partly defeats the purpose of bluetooth/hands free use.
To send pictures from the camera, you need to connect to your own email account (such as exchange, gmail, etc). While not a huge obstacle, it's frustrating that I can't just send a picture through the cellular account like EVERY OTHER camera phone in existence.
Google wrote a very cool Google Maps application for the phone which has similar UI elements as the highly rated iPhone google maps app. The app even supports a level of GPS/tower localization so you can pull up a map for your location. For reasons on unknown, this app works on EVERY phone EXCEPT the Treo 700. Most likely because Sprint wants you to pay for their GPS service (which may or may not work on the Treo).
PC Syncing -- I never got this to sync with my Mac. There are apps which attempt to remedy this, but you have to pay for them, and I never got the demos to perform adequately. This may be more specific to an Apple issue rather than the phone, but I still feel like it should just work. Additionally, I had limited success trying to connect via bluetooth to PC for file transfer.
OnDemand/PocketExpress -- WHAT IS THIS??
Text messages have no context (so if someone replies to a text, it can be difficult to determine which message it is in regards to).
As a phone, the Treo 700wx does have the ability to make and receive phone calls reasonably well. It did have better signal that my previous Sprint phones, so it has that going for it. However, as far as the "Sprint Features", I feel like Sprint has crippled the phone by limiting its GPS/Bluetooth capabilities in order to promote their other monthly services.
At this point, the phone is a few years old, and generally phones don't age very well, but the experience has soured me against buying another Treo for a while.