Well I have not added a cooked ROM yet but currently am getting used to all the features on the phone. One obvious drawback is the lack of an accelerometer. There should at least be a short cut button to change to landscape mode but you have to go into several different screens to actually change it. Also on the onscreen keyboard there is no @ button so typing email addresses quickly is not so easy, you will need to go to the symbols keyboard and search the several symbols for what you are looking for, but at least the qwerty keyboard has an @ symbol.
I will add more info the more familiar I get with the phone.