Thank you for your honest feedback - we always appreciate it!
You are right that TriEye requires a slight head turn of around 10-15 degrees to use the mirror - similar to glancing at a car side mirror. Most riders find that after just a few rides, this becomes completely natural and automatic.
If you are finding the field of view too small, it might be worth trying our Large mirror, which fits directly onto your existing cycling glasses and gives a noticeably wider view. Many of our customers actually prefer it for exactly this reason!
The big advantage of TriEye over a handlebar mirror is that it goes everywhere with you - on every bike, running, rowing, walking - without any setup. It also keeps your eyes much closer to the road ahead compared to looking down at a handlebar mirror, which many riders find significantly safer.
Glad to hear the photochromic lenses are working well for you - and we hope the mirror grows on you with a bit more riding time!