I use a Terastation Pro 1Gb model using RAID 5.
It's gigabit enabled, but can't really process more than about 700Mb/Sec read, less for write, which is a bit of a pain for large backups.
It's in the garage through wired ethernet Cat 5, without a UPS (but one's pending!). No problems to report. It also has an old USB drive hung off the back on to which I can automatically back up some of the stuff.
BW