They're so easy to use. I can hit the ball accurately...straight down the middle, no more topping the ball....larger sweet spot. I don't know much about swing plane, etc., I have a 'natural' golf swing I'm told, so I've never analyzed any of it, but one thing I do know...I've got 2 sets sitting at home.
I'm not real good yet with the short iron, so I'm still using my gap wedge, but in all fairness to the club, I haven't practiced with it, either.
I love them and like I said earlier....2 sets of clubs sit at home while these are always with me!!! They look weird and I figured if I didn't like them, they could serve as gravy ladles at Thanksgiving. Luckily, I haven't had to use them that way yet.