I have been to Blackwater (Now Academi) and it was top notch. The facility is unreal and the instructors are outstanding. I went for a patrol rifle class a few years ago, and I am going back on Monday for Street Officer Survival. Looking forward to it.
I have talked to people that have been to Sig Academy and they had great things to say as well.
I push people towards Blackwater because of the facility at least. Not many places have a 360 shoot house. I have never shot in one, but its a great resource to have.