I have one that I obtained with the SFS system already installed by FN. I have no complaints. I wouldn't have sought it out, but I am a police detective and my department will not approve single actions for off duty carry. However since FN officially registered the SFS as a DA trigger with the BATF (even though it really is nothing of the sort), I can carry that. The only downside is you can't use the safety lever to lock the slide back for field stripping the way you can with a normal Hi Power. Otherwise, it works no differently when you draw and fire: you still thumb the safety off during your draw just as you would with a normal SA Hi Power. The only difference to get used to is that you use your thumb to push the hammer forward rather than flick the thumb safety upward when you reholster.
The trigger is no better nor worse than a standard Hi Power trigger, and shooting it, it doesn't feel any different than regular SA Hi Powers I have shot or owned. I think the setup was devised to make the gun appeal to people who are just a little leery of carrying a cocked and locked SA auto (or departments like mine who are also leery of it). It has no actual practical advantage over the SA trigger. It doesn't alter the manual of arms for the pistol much at all. I think it just addresses the perception some people have that cocked and locked single actions are less than ideal. It behaves too much like one to make any real difference.
