It's good to see a poll, they seem to be less common these days...

I started with a twin blade Gillette Sensor Excel. I reluctantly switched to a Mach 3 sometime in my early 20's, thinking "why would a guy need a 3-bladed razor," clueless as to what would be coming in the future (this was before 4 or 5 bladed razors). Compared to the Sensor the shaves seemed wonderful, but I was still getting irritation.

It wasn't until late 2008 that I learned to use a SR, along with proper shaving techniques, and the irritation all but disappeared. It's amazing what happens when you do something the right way