Summary: I purchased the 1.5TB version in the spring of 2009 for use with my 24" iMac 9,1. Maybe I've just been lucky but I have been using it constantly for Time Machine backups and other small storage for almost two years. It has performed flawlessly. The only 'problem' I have with it is that it tends to spin down too quickly. Many apps will enumerate drives on startup and they will 'hang' until the drive spins up. It is only three or four seconds but it is annoying.
Summary: Simple plug and play setup, fast and quiet. I transferred 40 gigs of info from my old drive in probably twenty minutes with the Seagate plugged into the Firewire port and the old drive in USB. The manual is breathtaking in its brevity, so you have to search the Seagate site for more info. Only a couple of caveats. I bought this drive because I was having mounting/unmounting problems with my old external drive.
Summary: I bought the 1TB FreeAgent for Mac about a month ago. I don't think I've had it long enough to rate the reliability, but installation was a piece of cake. I think it took longer to decide which of the three included cables to use, than to actually plug it in and wait for my Mac to recognize it. I think the way it lights up when active is cool. The transfer speed is seamless - I'm using the included Firewire cable and it is connected to my Mini Mac.
Summary: My computer consultant recommended this product to safeguard my personal information in case of computer failure -- it's nice to know my new information is automatically stored on a daily basis -- if my computer crashes I have up-to-date backup. I assume it is working well -- it has not yet been tested.
Summary: I purchased this product after extensive research and after my former external hard drive died. It could not be easier to set up/ install. Mac users -- be sure to look for/ purchase the MAC version of the product -- using it with Time Machine is effortless. I am very happy with the product.
Summary: I have used this external drive for over a year now. I like it so much that I'm buying a second one. This drive does the job with no muss, no fuss. The only reason I gave it 4 instead of 5 stars is that the drive will occasionally decide to sleep after a long period of inactivity, and it becomes necessary to unplug the firewire cable from the Mac and then reconnect it in order to wake it up. I have had *no* difficulties with it while in use.
Summary: All signs point to this being a solid buy. It works like it's supposed to, backs up automatically as my Time Machine drive for my iMac, and looks nice with it's ever-glowing halo next to my 24" screen. (You cannot turn the light off and it has to stay plugged in to run auto-backup). Comes with all the cables for any setup - but you are best served using the 800 fire wire. USB is not the preferred connection for Time Machine.