My iPhone is the worst performing PHONE of my entire life going right back to the Motorola 'brick'.
Blackberry's are great for phone and email. The Bold needs the latest software revision though - first release had a few minor bugs.
I carry both and the iPhone is lucky it hasn't met an untimely death off a high balcony. DO NOT use an iPhone for business.
If you care about typing speed I estimate that I type on the iPhone at 25% of the rate on my Bold.