My 550XL finally gave up the ghost (touchscreen went bad) I upgraded to a 1535M. I like it fine and like that some of the things I thought the 550 could do better in menu and settings has been done. One thing I don't like is how it sometimes has trouble connecting to TT Go Live (on the right of the screen that white scection that comes up you touch). Seems like it has trouble keeping connection and trying to tell me about traffic or something. Eventually it clears up but just wondering if there is anything to it I'm not understanding.