If the cooling fan is a bit noisy for use in an office, may possibly be replaced by another (Warning, loss of warranty!)
Otherwise net throughput with 950Mbit / s.
Update 08/01/2015:
The newer versions have now no fan more. Kudos TP-Link! Because surely not about a manufacturer Customer feedback has considered ?! (I am not referring to my humble the review, but also to the many entries of other users in various forums.)
Bravo, Kottan! Bravo!
(Just read the 4 than 4 1/2).