Glad to help, Niel!
The great part is the combination of cost and flexibility. We use these on most of our systems - including Windows and Linux as well as OS X - and we have had great success both from a stability point and a performance point.
We also tend to combine them with this HighPoint Thunderbolt add-on for the Mac Pros (4 ports is just too few for real environments):
http://www.highpoint-tech.com/USA_new/series_rs6324u_overview.htm
Because the USB-3 ports on the 6324 are dedicated and not shared as with other USB hubs, you get the full rated 5GbS bandwidth on all 4 ports.
Tim
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Tim Jones
CTO - TOLIS Group, Inc.
http://www.tolisgroup.com
BRU ... because it's the RESTORE that matters!