TrustedReviews have looked at the QNAP TS-209 Pro Turbo Station.
A quote from the article:
QNAP TS-209 Pro Turbo Station Review
There's no denying the TS-209 Pro is offering a wealth of features at a
very reasonable price although performance isn't particularly exciting and the client backup software is very basic for an appliance aimed at business usage.
QNAP TS-209 Pro Turbo Station Review