He is a super energetic guy, so Vidal comparison is alright, but not the closest, since he is more physical DM with decent passing and running then Vidals offensive nose forward (he was lethal in this fashion in his prime).
But he really is exactly what our midfield needs, ballwinning, passing (its really sneaky good passer), and physicality and running with the ball when necessary, he's not that all too attacking, so more of a Pogba mould would be prefered, but his box to box play is decent enough to clear improvement on what we have. The chaotic way he bulldoze runs and dribbles reminds me more of a young Yaya Toure then a Vidal.
One or two more mids like him, but physicality and skill, and our midfield wont be bullied anymore (Matuidi has the physicality but non of the skill lol).