I had a rather seamless integration from gmail... I saved all my contacts on my old evo to my gmail account, then exported the contact file which was simple to load on the iphone. It has some issues with merging emails and phone numbers, but it's not horrible... Just took a little time on the icloud website to clear it up.
That's another neat feature- I sync my phone via icloud whenever I have a wifi connection (home, work). And I can edit things on my phone by using the computer (much easier).
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