My wife teaches dual enrollment English, and says that it is greatly beneficial to the people who take it.
I didn't do dual enrollment, but I did do Vo-tech my senior year, and it was really cool to have the college credits. I took computer programming classes. Plus, I became A+ certified and had my MCSE stuff done when I got out of high school. Unfortunately, I didn't get to take C++ classes.

The only thing offered at the time was Visual Basic and GUI applications. Oh wells, I'm the Access programmer/ database analyst for the state union now!
Good luck with your decision!
There's something in this room that makes you can't speak well.