I bought one and tried it out for the first time this evening after work. I would tell you, you do have to keep the shaft in correct position. It does not allow you to cheat. A friend of mine(Tyler Clark) who is a teaching pro, was coming off the course so I had him hit it. He of course is a PGA Pro and he said it would be a huge benefit. I struggled with it, and when I was doing the right things the ball jumped off the club face.
I went and got my 7 iron (MP-58) out of the vehicle, I was amazed after a half hour of using the Tour Striker how much cleaner I was hitting my MP.
For the time I can see myself using it during practice on the range. It was humbling, as is the game of golf.