The answer is yes; I for one have one and wrote this post on it using wiriting tool such as plaintext to write the post, which then syncs with dropbox which allows me to access my documents from the cloud.
I know of at least 5 other people with them in a reasonable sized office, which isn't a huge amount, but we never saw the same traction with netbooks in the enterprise which was the last big change in computing.
The reason people are giving for adopting them is for when they travel, the MS Exchange capabilities allows them to read and reply to email on a decent sized screen with a battery life that's way beyond any laptop. The upside is the same device allows users to read, listen to music or watch movies too.
Rob is the Group Head for Telecoms Sourcing for Western Europe and the Nordics and manages a team providing all aspects of Telecoms sourcing to Orange Business. Rob owns the Commercial relationship with major carriers across Europe on behalf of Orange Business. Cost reduction, re-negotiation, competitiveness and subsequent impact on country P&L are key activities that Rob drives across Western Europe.