I just completed another server installation for Blackberry Enterprise on one of our client's servers.
I am convinced it s a status thing like Apple, and not the best thing out there.
Windows Mobile is free, and does everything that Blackberry does, but without the cost or other issues.

What other issues are there?
1. Its not as secure. You have to lower the security of the server to get it to send emails. Although Microsoft admittedly was the one who forced this....