Contrast showers

So, I've been looking into ways to improve my recovery and came across this method, which seems interesting. According to wikipedia there's some debate on their effectiveness, so I'd like to hear some opinions on the subject; Has it ever worked for you? Do you know some reputable sources who recommend them? How about some studies?

I thought in SAA they said the only way to a speedy recovery is to stop engaging in S+M activity. I'm not impressed Yum. Especially not at the start of the new year.