I've stopped reading when he really recommended that you get a USB 3.0 drive to connect to a RPi :P
I kept reading expecting an explanation for this, but there isn't one. Does he understand the difference? Who knows.
The explanation of "every step of the build" is pretty limited too.
I do understand this but what is wrong with recommending picking up a USB 3 external drive over USB 2? I doubt the Pi is the only device it will be used with.
"I am still working on the best way to access the data without disconnecting the drive from the Raspberry Pi every time I want to add/remove something."
It sounds like he's putting the data on the USB drives from other computers, not from the RPi.
with a 150Mbps wifi adapter
plus, the RPi can't even achieve full USB 2.0 speed, it is not a good choice for a file server.
FWIW, in this use-case the limit is the wifi or more likey your internet connection speed. You don't really need blazing disk read/write speeds for your "Dropbox clone" - if you can read and write data as fast as your adsl connection goes - anything more is "wasted". As a general purpose file server though - yeah, a 'Pi isn't going to stream multiple HD videos to all 4 bedrooms on your home network.
Both my wifi and internet connection speed are well over the 2megabytes/s I'm getting on my pi, which really is the only downside I have found with my pi.
When I setup a file-server for myself, I set it up on the local network I use most, so the Internet speed is relevant, but not that much.