I've dabbled with Network Attached storage in the past, from putting specialized Linux installs on old PCs to using routers with USB ports for external drives. The Pogoplug 4 is easier to setup than anything else I've used - but that's not to say it's easy.
I filled all 5 open ports on this device, from the SD card to 3 USB attached drives (2 USB-3 on the back, and a USB 2 under the removable top piece) - there's also a SATA connector on the top for a 2.5" notebook style drive.
Supported filesystems are limited to the most common - NTFS, FAT & Macintosh drives should pose no problem, but EX-FAT & Ext3 are too exotic for Pogoplug. That's only a concern for connecting drives to the device in the first place. Once set up, the filesystem is invisible to the network. Like many people, I do not have a fixed IP address for my internet service, this is not a problem for the Pogoplug, since it uses the my pogoplug web address and lets me see the device no matter what address my ISP gives me at the moment.
I agree with the users who mentioned that there's not a lot of company support, but for the price of the device, I never expected it. Any issues I encountered were easily solved by a websearch. Every problem I encountered was already solved by someone who shared it online. Setup wasn't too difficult, and once running, the device has performed flawlessly.
My biggest issue is with accessing my files from the road, since my ISP's upload speeds are pretty bad, but that's no fault of the Pogoplug.
If you have some older drives, SD cards or thumbdrives lying around and want to put them to good use, the Pogoplug4 makes them as easy to access as any internet site. Once you set it up, you will likely be able to forget about it for years. It just works.
At least it has for me.
btw - I forgot to mention there are pogoplug apps for Android, iPhone etc which make the box very easy to use from the road.
