I have and I can't say that I absolutely love it. Not sure if it is just one more piece of equipment in the loop, but I fell in love with one of the IRs, and the rest were just missing something. Rather than chase it for a long time, I gave up and went back to my standard settings.
I do love recording directly from the Headrush. Just so many less cables and less moving parts. But for playing through an amp, I can't get the headrush to sound as true and real as the 11R. And I have spent more time on the headrush than any gear I have ever owned.
If I were to review, I would say; 11R for rehersal, live playing or micing up a real amp. To plug directly to the board - headrush direct rather than 11r with other outboard gear and external IR stuff, etc.