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For me it was the extra memory(nice having everything on the device), built in wifi(no more sleevefor me....almost still use sprint cf card), new os(I'm finding alot of nice things with this os, plus it's very stable) and the new cpu(it's just fast). I still have my 5450 but I really like my 5555 much better, it's just the little things that added up to make it a better device.
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