Former Blackberry users who regret switching to iPhone?

I've been a loyal Blackberry user for over 6 years. I love the physical keyboard, I adore BBM (especially because the people I message most frequently also have BBM), and immensely appreciate how (unlike some phones that are a bit slow) instantaneous the email forwarding is to my Blackberry.

Unfortunately, my 3 year contract expires soon and I don't think the Blackberry Q10 will be out in time for me to get it (I have no interest in the Z10 because if I'm going to have a Blackberry, I want the keyboard; if I absolutely have to go without a keyboard, I will hands down get an iPhone). I don't want to renew my contract with a new phone of my current model (Bold 9900) because that seems like a waste, which is why I've been considering an iPhone.

To Blackberry users who switched to iPhones, do you regret the switch? How much do you miss the keyboard? How does the battery life compare? Is the push email as fast/instant as the Blackberry? Is the memory sufficient (I heard the numerous Apple updates hogs memory)? Do you miss BBM?

Added (1). Oh, and I know I'm going to have people suggesting one Android phone or another… Thanks, but no thanks. I have no interest in an Android phone whatsoever. I'm only interested in either Blackberry or iPhone.

I got my iPhone a month ago, I upgraded from a BlackBerry Curve 9320.In the beginning it was kinda weird not having BBM, but I actually like it, because Broadcasts irritate the living lava out of me. The keybord was also one bummer. It is kind of hard to text with it, over BlackBerry's ease of use QWERTY keypad. Overall, I think it was a great desicion I made to get the iPhone! I don't regret any minute of it, And I also think you won't neither. Hope I helped.