Stressfire may not be if an experienced shooter.
Probably depends on the shooter. I've taken a lot of classes and I still try to take an 'intro' level class every year. Why? Because the more classes I take, the more I realize that the fundamentals are where I ought to be focusing.
So, if a good instructor can clean up some flaw in my grip or drawstroke that would have otherwise gone unnoticed, I feel I've gotten my value out of the "basic" class. If you feel the same way, Stressfire might be worth it.
Even if you don't feel that way, if you're an experienced shooter who's never had any formal training, you might find some of the technical instruction useful. You'll get drawstroke by the numbers, shooting out of the notch ("stresspoint index" in LFI-speak), one-handed shooting, etc.
Having said all that, Stressfire is a very basic, 101-level class, appropriate for new shooters. The main focus is on fundamental skillsets like grip, stance, trigger control, etc. If that's not what you're looking for, you might consider just doing the Judicious Use of Deadly Force portion of the class. You'll get all the good legal stuff, skip the range portion, and save some coin.