I have this phone for about a year and a couple of months and I love it. It is a phone dedicated to music and it also has a good camera, that would be the short description.
In longer words, it is a phone that can be used for mainly everything you do. You can film and take photos with it (as long as you don't plan on having incredible-quality videos/photos, it is good to catch an UFO but not to make a movie about them). The music player and the sound quality are brilliant, except the speaker which is mainly pretty lousy.
There are only two things I hate about my phone, firstly (I think this may be a defect of only my phone) dust always enters in the front camera's location and it can be quite annoying, also the light sensor is blurred and the phone might have "light variations". The thing I hate most, and because of which I had tot take my phone in service twice is the Sony Ericsson adapter, the one where you can plug the headphones, the charger, the tripod (if you have one) and any other SE accessory. It is a very good idea to make this but it can be very annoying when it breaks so often.
Just got this mobile a few days ago and it is an amazing piece of kit with so many features to use, i felt the side buttons really easty to use and operate the gyroscopics or whateer its called which turns music volume up and down by tilting the mobile was tricky at first but is easily managable after a few goes, i am left handed and changing tracks was a pain for me as the button is off centre but thats just nit-picking..
I noticed the shape of the phone was perfect to fit in the hand and thet diamond grip pattern is great for those nudges on the bus or train. The music player is great although there are lots of "Pages" to go through to reach a song which can be time consuming. The camera is fantastic, 5mp is great especially since the cybershot version has exactly the same features except one option to print pictures directly from the phone but if you chose this phone then that's obviously not why you bought the W902.