I really enjoy Sneaky!Harry, I dont know that I have seen this exact character type used before. Angsty!Harry, Angry!Harry, Grey!Harry, but not Sneaky.
I think anyone over the age of 12 realizes that although PS and CoS were written for 12 year olds, the rest of the story did not really "age" with the readers. By the time they are sixteen or seventeen they should have been flirting, sexually active, and the tone of the story should have been overall more "mature". Thank you for bringing our childish, moody, angsty Harry into the "real world".