After demoing the Callaway X18s, Taylormade OSS, and Nike Slingshots I fell in love with the Cleveland CG4s. I likes the x18s second best but appreciated the feel of the CG4s. The Taylormades had a terrible grip IMO and if I bought those I would have to regrip immediately since they felt very very slick. The Nike Slingshots just made a strange whistling sound when you sung them, I am guessing the partially closed cavity back is the culprit and I found myself paying more attention to the whistle rather than my swing tempo. The CG4s just have a buttery smooth feel and are very forgiving, their CMM technology is for real. Also I liked that the CG4s for their size, they are not as oversized as some of the others yet offer as much forgiveness IMO. If you want some game-improvement irons these are a very very nice set of irons. 

I previously bought a CG10 60* wedge and 56* sand wedge and loved the way they hit so I figured I couldn’t go wrong with a set of CG4 irons. These irons are just as forgiving and still offer plenty control as any of Cleveland’s world-class wedges. It did take me a little bit to learn to play this set as I do hit these clubs a bit higher and gained a little distance compared to my last set. Cleveland has really expanded their expertise from wedges to any club today. You cannot go wrong with Cleveland.
After several more rounds with these irons I am beginning to get the hang of them. On the down side the D wedge has a tendency, for me at least, to balloon up sometimes. Also I should note by saying that I don’t use the 2-4 irons. Hybrids are the way for me with low irons. Other than that these clubs are great.