Well he's not as good as Buendia so paying more than £30m for him would be a bad deal for Villa. But it's Norwich's right to set whatever price they like for him, we're not entitled to take who we like at the drop of a hat (unlike a certain team in sky blue).
I think he's probably similar to how Jack was seen a few years ago, Norwich fans will wax lyrical about how good he is/will become, and opposition fans write him off as overrated. That's not to say he will follow in Jack's footsteps and become a superstar, but it also isn't totally unrealistic to think he could do really well in the Prem.
I can't say I've seen much of him so I've no idea how good he really is, but his assist from Norwich's game yesterday was pure class. Plus he has floppy hair, so he would fill our quota in that regard as well.