Actually I own a similar unit from Zotac, the ZBox HD-ND22 and I use it daily with no problems.
The main advantage is they are compact, run very quiet and uses next to no power (20w at the wall in my case).
Saves me firing up my gaming system with SLI GTX580s and an overclocked i7 just to read some e-mail or watch a video. As you can imagine we have shaved off a fair few pounds on the energy bill.