5 hours talk time is 300 minutes. Look up your phones specs, chances are you have about the same.
16 hours audio playback is lower than most ipods now, but guess what, this thing is more than just an ipod. If you want a music player only, the option is available to you.
When you think about it, how often are you without power to recharge? If you are at the office and are talking on your iphone, you could have it plugged into a power source, or more likely, you'd use the land line to make phone calls and your computer to send email. On the road? Many options are available for phone chargers. Plug the thing in, make the phone call, put it on speakerphone, set the thing down and continue driving. Away at a conference? Likely to be in meetings/seminars where you aren't using your phone, and if the need arises there is going to be either a dedicated speakerphone for conference calls or a power source for your iphone won't be too far away. Skiing all day? Guess what, you'll be skiing, not talking on your phone for 5 hours, and 16 hours of audio playback is a lot more than you can use skiing for a day. Plug the thing in when you get back to your car/hotel room.
Yes this thing may require you to have a charger on hand when you go on weekend trips, or force you to buy a car charger, but it still beats taking both a cell phone and ipod around.
The price will probably be a turn off for many, especially in the business world. The touchscreen wireless Qwerty keyboard may not work as a real one on the outside of a blackberry, that remains to be seen. Also, many professionals who use blackberrys probably won't care about the music features or even colour, and thats fine, there are cheap options out there available to them. But for many younger people or people who love gadgets, this is an opportunity to combine 2 everyday things in a very usable package. Barring any major issues in the first couple months, I'll be trying to get one when it comes to Canada. I can justify the cost because I need to get a blackberry anyway and I can ditch my razr and sell my ipod. I'd have to pay for the voice/data service plan anyway.