I have gone from a 7730 to a 7105t to a 8700g and finally to the 8100. The hardest transition for me was going from the 7105t to the 8700. I found myself pushing the wrong letters, like if I wanted an "s" I would push "a"...took a few days to get used to using a full qwerty keyboard again. Suretype was easy to get the hang of...just keep typing and let the blackberry figure it out. I have rarely run into issues with words or grammer. The 7105t was an ok design but the Pearl gives you all of the blackberry functions in a nice phone form factor.