A little info on Miller for you...
Excellent athlete, very strong, good in the air, good on the ball and good going forward. Can hit a decent cross and has a very dangerous long throw. Gets the occasional goal from set pieces.
On the down side, he can make rash decisions and tends to lose his man in defence. I'm hoping the Championship will teach him discipline in defence. If so, you've got a cracking player on your hands.
If not, he's a surly liability.