If you're going to use a mouse, keyboard or memstick with it or simular low powerconsuming hardware there's no problem in using a selfpowered hubs... just don't expect to be able to run a set or 4 external harddrives on it or something.
Not trying to hijack the thread but in a related question, does the USB hub requier special software/drivers to run? Why I ask is cause I have a Spider2 on the incoming and have 6 USB ports in my tower and I was thinking of linking the ports on the tower with the internal connector of the spider through a 7 port USB hub (not selfpowered). Anything I sould be aware of or is it just connect and I'll be flying? Also Spider2 is claimed to be running highspeed USB2 but will it realy come close to the top speed of 60MB/s?