I can't say enough about this toy. If you stick with stock software, you're limited to 1 logon for the remote access program (you get more if you pay for the upgraded software). Considering that my wife and I use it to store and watch photos & home videos (and some movies) from around the house, or out somewhere, 1 shared logon works fine.
I have mine wired to my router, which is also connected to my HTPC, and it runs everything off my 3TB seagate fine. I don't get much lag when I connect to it wirelessly with a laptop or phone, either. About the only problem I've noticed is that the Pogo tends to not respond if I haven't connected to it in a few days. If I toggle it off and on with the included software, it starts back up within 30 seconds.