One of my biggest fears is the fact that I do not have access to multiple devices. I can only check it on my current phone, so I have no idea how it will respond to an older device with a lower screen resolution or Android build, and I will not know how it will interact with the equipment, and not on my current phone (trackball, etc.)
Also, with all the different user interfaces (sense, touchwiz, etc.), I am afraid that the use of color may not reflect very well on a particular user interface (for example, if I have an application with an amazing graphic effect, color).
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