From reddit:
He is without any doubt coming to you.
I have been following and writing about Dutch football and Eredivisie since 2003. I've learned to see who will succeed and who will fail abroad. Janssen (unlike Promes, that you were also looking at) is made for the Premier League. This is not a player that lives on utilizing mistakes, like Kezman or van Wolfswinkel and it is not someone who dominates through his superior technique like Afonso, or pure physical strengths like Luuk de Jong.
You might get the same reactions as when Liverpool signed Luis Suarez, "lololol is it the new Ryan Babel??? HUNTELAAR? AFONSO???". Its not. He might never become the same level as Suarez, but he is complete as a footballer which is what it takes to play in a PL top team.
He is a Kluivert, van Hooijdonk or Hasselbaink type of player. Powerful, can score both with his feet and in the air, great target player and most important of all, both according to PL standards and the wise teachings of Cruijff: Vincent Janssen does not need to be provided space, he will create it himself.
It is a phenomenal signing. This first season, he will be excellent as a "pinch-hitter" in your team, and since he shows exactly no signs of the pretty common Dutch complacency, I am certain that in a year he will be able to compete with Kane for the starting spot or force the manager to play with two forwards.
As someone who kind of likes Woolwich in the PL, it almost makes me sad seeing him get picked up by Spurs. Happy for AZ as well. They cannot afford not to sell him and with less competition they would have needed to accept a bid for half the sum. But £20m is still a bargain, there is a striker crisis going on in football as everyone wants be a winger or false nine and out of everything realistically available on the market, I see no better choice.