PureOverclock published a review of the NZXT IU01 USB Expansion Module
A quote from the article:
>> NZXT IU01 USB Expansion Module Review
With the ever-growing popularity of USB devices, whether they are internal or external, there never seems to be enough space for all of your devices. The NZXT IU01 USB Expansion module has the capability to expand your internal USB devices by taking up one slot and giving you six in its place as well as two external USB ports. With its own power drawn from the power supply, your motherboard will be taxed less as well as giving your external devices more power for a more reliable performance.
>> NZXT IU01 USB Expansion Module Review