Hmmm, looks like you're misinformed about 1.1 devices running faster:
http://www.everythingusb.com/usb2/faq.htm
Quote:
<B>Will USB 1.1 devices run any faster on a USB 2.0 bus?</B>
No. However, the new USB 2.0 archiclecture allows more high-speed USB 1.1 devices, such as webcams, audio devices, to share the bandwidth. Developers need to follow USB 2.0 spec in order to design higher speed peripherals that can take advantage of the extra bandwidth. USB 1.1 devices still operate at 12Mbps at full-speed and 1.5Mbps at low-speed on a USB 2.0 bus. Even though USB 1.1 devices won’t run any faster, they can work alongside of USB 2.0 devices on the same bus.
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I suppose you'd notice a speed improvement if you were previously maxing out your bandwidth, but unless you're using several high-speed devices at once, I doubt that'd happen.