I like my X7510 because of it's screen size and keyboard. I can't compare it to the Touch HD since I have not tried that phone. The only things I can think of not liking about the Touch HD is the lack of keyboard and slightly smaller screen, otherwise, I don't think you would hate it if you go for it. But for me personally, I prefer clamshell devices, or at least something with a keyboard, so the Touch HD does not appeal to me in any way. I hate touching the screen most of all or at least give us the buttons so we have an option not to touch the screen.