Experience with Advanced TDD courses delivered on-site?

We've spent the last year broadening and deepening the use of test driven
development in our organization, with varying levels of success.


We continue to identify areas where we can further improve.


As part of that improvement effort, we'd like to have a 2-3 day on-site
Advanced Test Driven Development course in April 2015 for about 60 people.


Any recommendations of good instructors, or well perceived courses?


ObjectMentor offers an Advanced TDD course.  The course outline looks like
a good match.  Unfortunately, they aren't responding to my phone calls or
e-mail messages.


-- 
Thanks!
Mark Waite