Do you manage a platform with over 4k blackberry handhelds though?
To be fair it's been a bit better since we upgraded to BES 5.0.3 MR2 but still not as reliable as the ActiveSync devices.
No - the most I've managed is around 1k. The main reason why I think ours is okay is because we installed the latest version and then deployed (i.e. there's been no upgrades) on the old sites there weren't as many users and the upgrades went fine.
I still think the web interface could do with a little work but, touch wood, we leave it alone apart from provisioning new users and all is well.
M.