No, I haven't been riding street bikes since the age of 4. I kinda figured that was obvious, but no. However, I've learned alot from dirt riding. Presently I ride a drz 400 s. Its street legal, and I've put atleast 16,000 miles on it on the street. Before that I rode a Yamaha Virago 900 something, 926 I think.
I've had numerous dirt bikes through the years though, and I've ridden them on the street. I have never, ever wrecked a bike on pavement.
Now, I have a couple questions about this msf course that I couldn't find satisfactory answers to on the site. A couple what if scenarios I'd like you to answer, scenarios that have actually happened to me.
1. You are traveling on a 2 lane interstate, bumper to bumper traffic, in the fast lane, concrete walls to your left, solid traffic in front and behind, at 45 mph. THe old woman in the minivan to your right talking on a cell phone starts to merge over into your area as if she does not see you. The honking of your horn is useless, there is no way to accelerate, due to heavy traffic, and likewise breaking is not an option. What do you do to avoid certain death?
2. You are traveling down a 2 lane country road at 60 mph. As you aproach a right hand corner, you notice a vehicle coming in the oncoming lane, and a second vehicle traveling about 100 mph passing this vehicle coming head on at you. There is no time to break, and no spare lane to move into. The side of the road is about 1.5 ft wide of grass, and then drops down a 6ft embankment. What do you do?
As I mentioned, I was in both of these situations. I have never been instructed as to how to handle such scenarios, have you? I promise 9/10 people faced with such problems would die, or have been seriously injured, MSF or not.
Also, I know people who have taken these safety classes, and still ended up wrecking. I also know several people who have ridden dirt bikes through most of there life and switch to street, and, have never had a problem.
When you've rode through stuff like this;
there is little a class can teach you.
Now, if you haven't ridden, and are looking to get into riding on the street, you certainly should take a course on bike safety, and, I would go a step further and recomend spending some time on a dirt bike. Learning to ride in mud, up and down mountains, through creeks, rivers, sand, over logs, sliding, stoping, jumping, etc, are all very important aspects to bike control. Of course, not everyone will do this, so, atleast get the class.
Also, something else worth mention and I will not hijack anything further. Most "Professional bike racers" will not ride on the street. There are to many unknown variables they are not prepared for. On the track, its nothing but corner entry speed, exit speed, braking, acclerating, and watching out for other racers. On the street, its all this and watching out for idiots on cell phones putting makeup on.
I ride over logs about 2 ft in diameter, a 2x4 is a bump in the road.
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I tend to dart 
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Also I have drastically improved my braking
