Michael,
The test version was a USB 1.1 only device. When we tested the device on a Win XP PC with USB, we achieved speeds that very similar but marginally less
Perhaps the slightly better speed is down to Chris Hodges' more efficient USB stack... BTW: he was helpful in getting the device working in the first place.
If we had our Subway working, it would be very nice to test the device, but it smoked when it was installed!