Lukaku, despite his stature, is not a player who is ever going to be brilliant at playing with his back to goal, holding the ball and bringing others into play - this is the role he is often playing for us and he is not as good at it as you would hope.
His real strength is when he is facing goal and can use his speed and power to be direct. We rarely give him the opportunity to do this. He is also a pretty decent finisher, yet we create relatively little for him in the way of chances.
He's a good player, and playing in a side like Dortmund who are all about speed of attacks, he'd be excellent. He'll get his fair share with us, but we don't really play to his strengths and I'm not sure we will adjust our style of play to make it work. If Lukaku was prepared to come here permanently and Chelsea wanted £20-25m, I'd have a long, hard think about it. I agree he's a good player, and maybe he's the best we could hope to get at that sort of money but I'd seriously think about whether or not a different type of striker might be more suited to us, especially since spending that level of cash would be the vast majority of our transfer budget and to my mind we could need anything up to 6-7 players this summer.