Ecki already mentioned it today on fooore.de: we had the chance to play a new training club yesterday, the PSP golf training club.
Regular steel shaft, it has the loft of a seven iron but the club face is just a fraction bigger than a golf ball:

Essentially, there is no sweet spot as the whole club face is the sweet spot. So, if you don’t make accurate contact with the ball, poor or no ball flight will be the result. This may sound like the hard way to learn or improve your game, but when you’re able to hit the ball straight with this club you might as well go ahead and buy yourself a nice set of blades.
We did hit a couple of shots during our tournament round with the PSP and the result was almost identical to shots with my regular seven iron, a little shorter in distance though. The ball flight was more nervous compared to my regular shots, the ball meanderd through the air a little bit.
I didn’t test the club thoroughly enough to get some deeper insights, but Ecki will do that next week, so make sure to visit www.fooore.de for an update on this club.