A lot of the schools mentioned also use R22's.
The R22 is by far the most widely use machine for training
Enstroms are not the only machines at Barton
There is a new helicopter school started at Barton flying R22s and also there is a freelance instructor who has been operating an R22 and other machines out of Barton for at long time
At 100hr less per hour for the robbo than the enstrom i think MHC and FA might feel the pinch