Last week I managed to hit some shots with the new TaylorMade R11 irons. The irons are very forgiving and easy to hit, no doubt. I wasn’t very warmed up but I still hit them quite well. The back of the club head is sort of a cavity with muscle back which has an air gap between the cavity and the weight. You can see the gap in the 1st image below.
The R11 irons are certainly NOT blades or “tour only” clubs. The top line is fairly thick as is the sole, and the club head is fairly large. They’re obviously meant to be a more forgiving design.