I also agree, Upgraded from the Burner 2.0 irons (level 27+) which they sell now as the Rocketballz (level 27+) and am very happy with them. With the right backspin balls you can stop them on a dime and even have them roll back a few feet as well. I use the 10 credit WGT balls and they work fairly well with the irons. Not a whole lot of difference from the higher level ones. And lower priced as well. Even better if you use the Srixon (11+) balls.
Eventually you need the higher trajectory irons as you level up and these are worth the credits. Watch a whole bunch of videos and do some surveys and you can split the cost in half, I only used about $9.00 of my own money to get these.
Happy Golfing!