Has anyone tried pre-3.1 Blood DK tanking? Is it viable?

Looking at the 3.1 changes, I am thinking that this spec may be as viable as Frost or Unholy. There is not quite the same AE tanking capability, but I think that Heroic Boss tanking may be just as viable.

The cool thing about the dual-spec option is that you can try out 2 new specs, or have the trusty old spec in reserve just in case the new spec isn't working out.