I have never attended a class at Front Sight
I am slightly acquainted with several guys who have taken handgun classes there.
Separate from an issues with their business model, I believe that Col Jeff Cooper's "modern technique of the pistol" is the basis for their instruction with the handgun, or at least it was when these guys went.
The guys I talked to said that they enjoyed the class. They were both fairly experienced shooters who had not had any formal firearms training since their military service. They learned a few new things and got refreshed on lots of skills they were already somewhat familiar with.
One guy did note that one of the assistant instructors they had obviously wasn't real experienced as an instructor, but he was up front about being new, and had a very helpful manner though he wasn't real experienced yet at diagnosing problems.
You can only learn from experience if you pay attention!