+1. I have never missed with the exception of a misconnect. Even when I have tried to miss flights, I can't. I am way to concious of my options and will run at full speed through an airport if I know the flight is still there. I guess the fact that I might miss an upgrade and have to sit in a middle seat in Y on the next possible flight is a major deterrent for me.

I refuse to book connections less than 45 minutes. It never ceases to amaze me how people get so upset when they misconnect and they only had 30 minutes to connect in the first place. Even in MCO, where weather is rarely a problem, I do not trust most of the airlines enough to pull that tight of a connection off.