The main thing is I get my irons wet and the brush is stiff enough to clean out the grooves. I hit a good shot, it sticks, and I'm putting for birdie. Only complaint is it kind of leaks from the hole where it's supposed to and from the cap, where it's not supposed to. It all pours onto the club, so it's a minor concern. I recommend, especially since it's a pretty good price.
Rating: [4 of 5 Stars!]