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As soon as i like the MDA I,II,III i decided to try them MDA IV or MDA Pro for one week. On the first look i was amazed by functions. This MDA is not looking like an ordinary PDA - it is closer to the small laptop.
Display is great and i was able to read web pages very comfortable because of high resolution. 2 cameras had no use for me while i take photos by photocamera and i dont use skype for camera that is inside. The keyboard is excellent - very comfortable and fast to write a message and seemed durable. The backlight is automated - when you are on the spot with worse visibility the keyboard backlight turns off and the keyboard is very well backlighted.
After first amazing day i saw that this is not a mobile phone. When the phone rings it has no second display so you dont see who is calling. If you want to talk you have to open the MDA-laptop with two hands so it is impossible to pick it without handsfree in a car or with a bag in your hand. The most horrible about this greatly equipped phone is the weight - 4 repro, 2 cameras and lots more you have to carry in your pocket. I was unable to take this phone to the pocket because it is rally big and heavy. The last thing is that the MDA pro is slover than MDA3 or MDA2 - it is because of high resolution and sometimes it takes a while to open text messages....