30 games in with him and I have to say he's amazing. Amazing stats on the card and "Saves With Feet Trait" means he can pull of the same saves as DDG. He also has "Rushes Out Of Goal" and "Comes For Crosses", which is great.
Having used DDG previously I hardly feel a difference. I'm not saying he is better than DDG, but IMO he's equally good. Obviously IF and SIF DDG is the best keepers in the game, but TOTGS Ter Stegen is 1/3 of NIF DDG's price. Also great for linking Boateng and Ramos together.