DanFST
Head Pro
The difference between SGI and chippers is that generally learners start with SGI irons and move onto better if they wish to progress. Chippers are more of a last resort for semi accomplished or time served lesser skilled golfers who cant get or have lost the knack of chipping.
I know plenty of players who use GI irons, and play very low handicaps. What I don't get is why does some people's pride/opinion etc. get in the way of making the game easier for themselves. And also why anyone bothers what anyone else does/wears/uses on the golf course.