Has anyone switched from iphone to a blackberry?

Any former iphone users decide to go with a blackberry instead? I am going to switch and I wanted to hear any of your opinion on it. What do you think about the Blackberry? Do you want to go back? Do you love it?

Let me know how you feel with the switch..

This also applies to BB users who went to iphone and switched back to BB. What are your thoughts?