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I had the BB Bold (9000) for two years before I got my iPhone 4 last month and I couldn't be happier with the switch.
One thing that I miss is the flashing red LED for when I missed a call or got an email or something. Also the speaker volume (for calls) seems low on the iPhone compared to my Bold. And of course I miss BBM.
Other than those though, IMO everything is better on the iPhone. No need for Google Sync anymore for full email push (Gmail set up as Exchange), along with OTA contacts and calendar sync. Love the iphone's GPS, and the hardware build quality is light years ahead of RIM's. I'm no longer at my carrier's mercy to give me the latest BB OS. And I don't miss all my carrier's logos and bloatware all over my device.