I just started using the Tri-Eye View Sport Revo Max and after a few rides, I LOVE them. As the training video suggests, it takes a couple rides to get used to them, but with a slight turn of the head, I can see any easily traffic behind me.
One other initial comment/question: I ride almost daily and spend 30-40% of my time riding on steep hills. My head position is the same on flat and downhill rides, but it is slightly further forward on climbs. I was wondering if Tri-Eye or mountain bike/ road bike climbers have any suggestions? Obviously, going on steep uphill climbs also inhibits the turning of the head in the same way as a flat or downhill ride. It might just be that I need to get used to it or try to keep my head in the same position at all times.
Again, I LOVE the Tri-Eyes and would highly recommend them!