Infoconomy has a great feature on how the must have pocket accessory for senior executives has a dark side - and those in IT know all about it.
The bottom line is that this little box in your pocket has far more status than value. Those that push it say the device is important in that it allows constant communication. The issue is that the mobile networks don't have the coverage necessary to make it the device as sold.
RIM feels that it has come up with the iPod for the executive class, I think that they have come up with email plague. The problem is that the messaging market is developing and presence is more important, I communicate more with IM and voice than I do with email because when I want to communicate I prefer a two way process and with email its not aways on. The thing that convinced me that Blackberry was not for me was the fact that not all those at the top of the mobile operators were carrying one, despite the fact they had two or more handsets!
On top of that we have RSI reports that too much usage was a bad thing!