I reviewed the Blackburn Mirror a few days ago and complained of high vibration at speeds above 20 mph, which renders the Blackburn mirror a poor choice for my rides. Slower rides are OK, though. So I wanted to replace the Blackburn mirror with the 3rd Eye Pro because it seemed like its larger diameter arm was going to be much stiffer with less vibration from wind. And...the verdict....it is so, so much better, so much more stable compared to the Blackburn model. The 3rd Eye Pro mirror is larger, too, which I did not think was going to be that much better, but it is better! Now I have a very stable rear view at higher speeds. And you don't have to spend much money, either.
Many complained about installation, so maybe this helps, even though I found the instructions pretty good. The mount is rather large, about twice the area of the Blackburn mirror mount. The slots in the mount allow for flexibility so its larger flat surface conforms to the curved surface of the helmet. It should be mounted on the hard plastic part of the helmet surface, not the styrofoam. I recommend using scotch tape to temporarily mount the mirror on the helmet to make sure it's in the right spot. Put the mount as low as possible on the helmet, and forward enough to get the mirror a few inches forward of your left eye. Place the mount so the pin/ball joint is vertical up and down. This will insure enough adjustment is available when you are fine tuning the position of the mirror and arm. I wear glasses so I have the view from the mirror coming through the upper left corner of the left lens. I unsnapped my Giro helmet's visor before installation to gain better access to the placement of the mount, and snapped it back on after mounting. Before mounting permanently, clean any grease or oil off both the surface of the mount and the helmet with isopropyl (rubbing) alcohol and a paper towel. This will insure a good bond with the self stick pad. Mount the self adhesive pad on the mount first by peeling off the large protective tape strip and carefully center and position the slots in the pad to line up with the mount slots. Then peel off the small protective tape and mount to the helmet. Push down hard so the flat mount follows the curve of the helmet. That's it. It comes with 2 self adhesive pads, but you could probably use a small amount of contact cement, too. Applying to both the helmet and the mount, letting it dry, and then pressing it into place. Don't get the contact cement on the foam of the helmet. Maybe mask off the foam areas near where you will mount it because contact cement will disolve and melt styrofoam. I would not recommend "Gorilla Glue" which bubbles off while curing, and it would have to be clamped until it sets up. Same with silicone cement. Some hardware stores carry very thin foam self stick pads. Thicker foam self stick pads may result in higher vibration and an unstable mount.
I am very happy with this product. Ride often and ride safe.