$ VBoxManage list usbhost VendorId: 0x0810 (0810) ProductId: 0x0003 (0003) Revision: 1.6 (0106) USB version/speed: 0/Low
C:\Program Files\Oracle\VirtualBox>VBoxManage list usbhost VendorId: 0x0810 (0810) ProductId: 0x0003 (0003) Revision: 1.6 (0106) USB version/speed: 1/Full
What I'd like to ask from other users, is to test it on their systems and see if it is a result of my OSX host (10.9.5), or it is a more widespread problem, before opening a bug report.
For reference, here's what the "OSX System Information" has to say about that specific device:
Product ID : 0x0003 Vendor ID : 0x0810 (Personal Communication Systems, Inc.) Version : 1.06 Speed : Up to 1.5 Mb/sec <-- That shows a USB 1.1 device Location ID : 0xfd120000 / 3 Current Available (mA): 500 Current Required (mA) : 350