Back in the day...
I trained with them in 1990/91. I did IFR renewals as well. John Montgomery has a fantastic product.
Like the wide-body guy said, their training works in the real world. It took me a little more than 3 years from the time I finished my Multi-IFR with Pro IFR to get to the right seat of a 737. Now I am a Captain for Southwest Airlines.
Fly safe!