Interesting thread to read for sure ... I've had iphones since they where introduced at the same time I owned a BB Curve and then a Bold 9000 with the idea at that time anyway to have the Blackberry for work and the iPhone for Play ...
My Curve didn't get used much once I got the iPhone, so I switched to the Bold 9000, I liked the keyboard on the 9000 and used it primarily for checking and writing emails ... my iPhone was replacing my Bold for everything else, phone, surfing, PayPal transfers, eBay, forums, weather etc ETC in was my experience that the iPhone was superior for all but email ... then I practiced typing on the iPhone more, time went by and like my old Curve my Bold 9000 started to collect dust, I was using my iPhone for everything.
With the anticipation of this new Bold 9700 coming and my thoughts that I should try it upon release because the physical keyboard was 'better' and that I could have my emails going into one box instead of having to touch-tap through to the multiple inboxes on my iphone.
On launch I bought the 9700 outright, charged it up, and set out to use it as my only phone and I put my iphone in my drawer. WOW - did I miss my iphone!!
I've owned BB's since their inception and the argument they have going for them is a secure network, BB Messenger, and for some it's better at handling email. (To my surprise I now like how my iPhone handles mail more than the BB, and I prefer the touch screen as opposed to a physical keyboard).
Surprised me, but I'm happy it turned out the way it did ... kind of a costly learning experience activating phones, buying outright and selling second hand but at least now I know FOR SURE what phone is right for me and for sure it's the iPhone.
Then I went through the recent phase of wanting to try the Motorola Droid and the Nexus One ... after reading reviews and playing with the Droid (Milestone) it's not for me.
My conclusion that for my needs, running a Business included the iPhone is by far the best phone on the market. It's simple, it works, doesn't crash or lock up, no battery or sim card pulling, the on screen keyboard is so much faster than any BB IF you practice, the screen is excellent, great app's ...
I tend to get bored with things, so I go through a lot of phones and notebooks. Being a Windows and Blackberry fan boy for a LONG time, it's a shock that the iPhone, Mac OS and MacBook Pro's turn out to be the best tools we can find ... coincidentally they're all made by Apple. Have I become an Apple Fan Boy?

That's bad isn't it? Or, is it?
I'd like to read from others who switched from an iPhone to a 9700 ... how are you liking it?