BUT I CAN'T USE IT ON A PLANE!!!

j/k, thx a lot for finding this one...

now, what's the transfer speed of data someone may expect from an external 7200 rpm HD to N900 with this bluetooth USB hub? any additional slowness issues using this system due to the use of bluetooth? (thinking about a USB keyboard connected this way for example, something that needs a quick response)
thx in advance!

ps. couldn't something similar exist using WiFi ? isn't wifi "better" than bluetooth?