OpenGL always on vs interactive

I just got into experimenting with OpenGL settings and noticed that if I set it to always on, the preview ALWAYS plays in full time. Its very fast.
If I use interactive, I need to do a RAM preview to get it to play in fulltime or else it will hover around 11-12fps.
I'm using AVCHD files and I'm using a GTX 260.
However, everything I've read says OpenGL isn't accurate and many people turn it off entirely.
I don't plan on rendering using OpenGL but would it really mess my previews up that badly?

EDIT: Nevermind. I figured out why people don't like it.
 
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