As long as you both have decent internet connections and the folders aren't too massive, it's not that laggy. Whenever I work remotely (which is at least once or twice a week), I access my pogoplug through my tethered internet connection (which isn't THAT fast) and everything responds pretty fast. The only time I experience a problem is if I'm trying to open a folder that has several thousands of files. If you want, send me your email address and I'll give you access to one of my folders, that way you can see what the speed is like for yourself!

And one more thing...if your hard drives go to sleep by themselves, it initially takes longer for your folders and files to show up because the drives need time to spin back up (usually 10 or 15 seconds in my experience). After that it's all smooth sailing!