I'm running BB Connect on my e70. It works great. You don't need to disconnect to browse or place a call. It's seamless. I browse the web while on the train in the mornings and emails come straight through.
The e65, e61i and e90 are all listed on the Nokia Business software site as devices that will use BB Connect, but the client isn't available yet: http://www.businesssoftware.nokia.com/blackberry_downloads.php
Oh, I don't think you can do PIN messaging although I haven't tried. I don't have a need for it.