As an older teenager, I'd like to post on this topic.
I'm still a "minor", so to speak, and I have some very unfavorable experiences with spanking...
I know that not all parents are the same and that some support spanking, but it can get so unreasonable. My mom's a prime example: She would get angry at me for things that weren't even my fault, and then she'd go nuts. Her last display of "discipline" was choking me in a fit of rage. Forgive me if I'm going over the line, but I believe that physical discipline spurred by anger can quickly get out of control.

Perhaps it's something that could be avoided? There was one more thing I wanted to point out,too-I became incredibly apathetic because of over-discipline.
Trusting my parents all of the time isn't exactly a good thing, either. I've experienced a lot of heartbreak and sadness by trusting my parents no matter what.
Lastly, my parents are NOT the "listening" type, so I can't talk to them about much, if anything at all..And by being unavailable, they're missing out on much of my life.
I really hope there's a better balance than being one way or another as a parent.