I have a helmet mirror and I would never ride without it! I love it so much that sometimes I wish I could have one on all the time...like when I'm out on walks. I don't care if it looks dorky...and mine looks especially dorky because I have duct tape on my helmet to hold it on securely. But my helmet it silver and white so the tape sort of blends in

As far as getting it adjusted just right, that can be a challenge. Mine has two places where it can swivel and move...I put a drop of Gatorade on those periodically to keep them sticky so it will hold its adjustment and not move around every time I hit a bump.