My first android phone was the X at launch. I loved it but after about two months I switched to the Droid 2 for a couple reasons. I was overall happy with the Droid 2 but me personally, I wasn't 100% in love with a slider. It was a bit heavy, not took bad, and my biggest peeve was the top row of keys was too cramped if you ever had a case on the phone. When sliding it open, the case with stick out a little further and almost overlap slightly onto the top row. The camera was not nearly as nice as the X, but we seem to have the same one on the Pro too. I love the Pro. It is fast, light, easy to hold. I love typing on the keyboard, perfect size for me. I bought the extended battery, and the phone feels better overall with the battery and new door on, almost as it should have came this way from the factory. The virtual keyboard is decent as well. I also like that there is a side convenience key now, like on the Be's, I have mine set to open texts. You can also program shortcuts to the keyboard as well. So there is like 25 more shortcut keys as well lol.
Overall I am very happy with my Pro, suits my style better than the D2 did