First, the screen is amazing, but it only pays off if you have good vision. In day-to-day use, you will notice the screen is sharp and colorful, but the real benefit is when you browse the web. Because the screen is higher resolution, you can fit more information onto the screen, but this results in text and images appearing very tiny. When I read the NY Times web page on the phone, the text is so small that I tend to have difficulty reading it.

Next, I wanted to mention that the speed of the user interface starts off fairly slow in the first day or so, as the phone is updating software, syncing contacts, etc. I spent some time deleting unnecessary applications and freeing up space on the phone. After a few days of use, the phone is noticeably faster than my old 8300. (Example: when marking all of my email as read, it happens instantly, as opposed to taking a few seconds with the 8300.)

Next, I am a big fan of the lock button on the top of the phone (the button is actually underneath the case--you just press the corner of the phone and it locks). It is much faster to unlock the phone with this dedicated button, but it is also easier to accidentally unlock the phone.

Finally, I have to praise the camera. It is a 3.2MP auto-focus camera with an LED flash that actually seems to work. The image quality is still below what a normal camera can do, but it is a vast improvement from the old curve. The shutter button acts like a camera shutter--press halfway to autofocus, press all the way to take a pic. I could get by with just using my phone camera even on vacations.

Conclusion:
Overall, I'm happy with my 8900, and I have no regrets about upgrading to this phone.