NI GPIB-USB-HS Multiple Units Running in Parallel?

I have FOUR GPIB Devices running on a NI PCI card on a single PC.  The only problem with the GPIB Bus is it must be a sequential read.  This forces me to read data one at a time and this isn't fast.

I found the NI GPIB-USB-HS.  

http://sine.ni.com/nips/cds/view/p/lang/en/nid/201586

This runs from a USB cable.  Can I read four USB cables at the same time and cut my GPIB read by 75%?

Can anyone confirm?  If you have multiple GPIB-USB-HS on a single PC, can you read all four GPIB Devices at the same time in Parallel?  Or does the GPIB-USB-HS act just like NI PCI GPIB cards with Sequential reads?

I need to read four GPIB devices at the same time I'm hoping the GPIB-USB-HS will do this...any other suggestions?

Thanks,

Doug