Pros: Very forgiving
Cons: Thick topline, minimal feedback
Those looking for feedback won't get that with this set, though. Hits within an inch of the center of the clubface are difficult to distinguish from each other. I've had many hits that felt perfect but seeing the mark on the clubface after the hit I can tell that I missed the center by a half inch. This is either a pro or a con, depending on what you're looking for in an iron. I got the clubs from someone who said he "outgrew" them, and for a serious player hoping to get to a 15 or under handicap I can definitely see how they would feel like they outgrew these clubs, but that's true of any set of SGI clubs.
The topline is very thick, and the 4-iron feels borderline like a miniature hybrid. (It makes sense that the MX-100 set, which replaced this set, comes with hybrids for the lower irons.) I came to these clubs from another set of GI clubs and still found the topline to be fairly thick. It put me off at first, as they almost looked ungainly, but after I got used to swinging them I completely got over it.
They're basically finely tuned shovels. They let you focus primary on swing path and reward any face-on hit. They have a good low COG so they pop the ball up into the air well.
The set I got came with a 4-PW, SW, and GW. I've replace the GW because I wanted a wedge more specific wedge-like. The GW in this set feels clunky for delicate greenside work.
I got these clubs as a 28 handicapper and am now a 22 handicapper. They served me well and made the game more enjoyable while I struggled through it. I will keep these clubs for a while, but probably upgrade after I drop a few more strokes from my handicap.