I just completed the 4 Day Defensive Handgun course at Front Sight just hours ago. I can without a doubt tell you my gun handling and tactics have improved substantially.
The training I received is top notch in my opinion. Very professional, very easy to understand and implement. I went with an open mind and actually changed the way I do a few things because quite simply, their way works well for me.
There are reviews on other websights that give the day to day breakdown of the course schedule, so I am not going to go into that.
I've got some videos I'll post up a little later that should give you a feel for what you can expect.
I can now go from a concealed, holstered position to two controlled pairs to the thoracic cavity, or a single shot to the cranial ocular cavity in less than 1.5 seconds from 7 yards. They also teach methods to clear most any gun malfunction, properly do a tactical reload, room clearing, low light shooting with flashlight, and lots of safety training.
They do teach the Weaver stance and ask you to at least try in for a day before you revert to whatever stance you use. I'm not real sure what shooting stance I used to use, but for me, the Weaver works well.
They have no issues with you using a Blackhawk Serpa holter. In fact some of the instructors even use them. Our head instructor even promoted open carry, said he did it nearly every day. My jaw nearly dropped when I heard that. Awesome. That brought up lots of questions on open carry and the instructor did a pretty good job answering those questions.
A couple reviews on Front Sight have said they are bankrupt, or in recievership, or use high pressure sales tactics, or try to get you to become a Scientologist, etc. If they are bankrupt, I couldn't tell. There were over 400 students there this past weekend, and the facilities were well taken care of. During lunch they showed the Front Sight promotional video that promotes their memberships, but it was not required to watch it and wasn't part of any of the lectures. Wasn't very high pressure to me FWIW. I never heard any mention of Scientology. Everything I experienced was professional.