[DEMO 1] I've played a few single player matches and two player vs player matches, and so far I have to say that I'm impressed. I noticed a bug where the keeper ran with the ball in his hands outside the area and "spawned" back, but nothing major. I like the pace of the game, playing at 0, and I also like the extra "oomph" the passing and shooting has gotten this year. I also like the way every match seems very different from the previous, unlike most PES's and FIFA's in the past where every match were more or less the exact same regardless of teams involved.
I'm sure there are some flaws I've overlooked, but overall I have to say that I am impressed.
EDIT: I've been using default formations in every match, and for once they seem to work fairly well with the exception of Fluminese's. I had to change during the break to get some more players forward to create chances.
EDIT 2: Playing 15 minute matches, and no other mods.