Summary: Do not purchase this unit if you run Windows 7 or if you are looking to backup computers on a network unless you want to purchase additional software. I purchased this to hook up to my router so that all computers on my network could do automatic backups. The software that comes with it (Genie) will not work on a network. For that "you'll have to purchase Genie Pro". That is a quote from LaCie tech. If you have Windows 7 (which I do) "you'll have to purchase Genie Pro".
Summary: I use this with my Windows 8.1 laptop with it connected to a wireless router. I find that when it works it is great. But find that it often needs to be restarted as it seems to not bring up the network interface correctly.
Summary: First off, for a gigabit Ethernet machine running on all Cat 5 Gigabit LAN it was average speed. Maybe a little slower than average. The main issue is LaCie's claim of being Time Machine friendly - I set up 2 Macs to back up to it and after about 5 weekly back ups I got corruption messages from OS X saying I needed to start over. Went through that 5 times over 3 months and have given up. Lame.
Summary: Brought this network drive as it seemed to have reasonably good reviews. Well I should have taken more note of the negative reviews because they are spot on. This drive looks very smart and is quiet, hence two stars. Would make an excellent door stop! It worked for a few days but not without problems on my Windows 7 64bit system. It would only show up as a media player and I could not map it as a network drive.