About the SFS...
I like it! My first Hi-Power was an SFS. I bought two more and eventually converted all my 1911s to SFS with Cylinder and Slide kits.
To set safety, just push hammer forward (finger off trigger). Everything locks up. To take off safety, just push down onthe safety (on the SFS they call it the cocking lever). The hammer snaps to cocked position and you are ready to go. One complaint I have heard about Hi-Powers is that the safety is not positive--it doesn't click in and out of place. With the SFS it clicks both in and out.
Also, You can tell by touch if the safety is on--the hammer is down. If you find that you are not on safe and you want to be, just push the hammer down.
Some people report that they accidentally activate the safety when shooting rapid fire (especially with lightweight 1911s--hence the need to "ride the safety".). With the SFS, this cannot happen. You must push the hammer forward to go on safe.
People who have done a lot of shooting with Hi-Powers sometimes prefer the traditional configuration. I have seen the SFS describrd as an "ingenious solution to a non-existant problem". Others refer to "more things to go wrong".
As the expression goes, "you pays your money and you takes your chances." Make mine an SFS. Six pistols--no malfunctions. I like the system.
Lou