Former WM6 user who just picked up a Pearl. Had it for less than a week so I'm still getting used to it. Not sure how I like it compared to my Shadow yet, but its starting to grow on me.
I switched from a sprint ppc-6700 to the Alltel 8703e and then 2 months later got the Alltel 8830we. It is quite a bit different, but it's been an easy transition. check out some of the howtos here, browse the boards, and post any questions you might have. This is a great community; lots of helpful people.
Welcome to CB - a friend of mine used to run WM6, then the other side of his brain started working, saw the error of his ways, and then reached out to fulfill his Blackberry enlightenment
