I really like the Q simply because it can do more, it has a better camera, better interface and has the blackberry style wheel on the side for easy access and its really thin. You can also customize more on it than with the treo 650 (I have owned both and used both of them for 6 months each, I am still using the Moto Q and still loving it. Both are very durable and the treo can last even if dropped in water(I found out personally) Both are excellent phones but I recommend the Q