I personally have some light sensitivity issues that are heightened by acute astigmatism, which means I have to wear prescription eyeglasses most of the time or risk light-triggered migraines. This is especially true when driving during daylight hours and dealing with the sun's multiplicative reproduction off the sea of cars ahead of me. The UA Alloy Satin Gold sunglasses have completely eliminated this issue for me, which is likely from a combination of the light-brown color and polarization of the lenses.
Similarly, I've had issues with other sunglasses in the past where light would bounce from either the side or behind me and off the inside of a lens, causing visual discomfort. But the relatively flush design of the UA Alloys combined with excellent peripheral coverage has removed that facet of wearing sunglasses. As I live in San Diego where it's constantly sunny, addressing that reflection is a key feature.
The aforementioned stability and hinge strength make wearing the UA Alloys complication free. The inside of the temples, temple tips and nose pads are all rubberized, which has meant very little (if any) adjustment has been necessary to keep the frames positioned to my liking. Maintaining Under Armour's moisture-wicking idealism, the rubber has numerous perforations that minimize rubber-to-skin contact surface area and keep the wearer from sweating even after having worn them in the sun for hours on end. However, the fairly straight design of the temple and temple tips sometimes leave an uncomfortable feeling that the sunglasses might fall off at any moment. While this concern has proven to be superficial due to the excellent friction of the rubber and the strength of the hinges, the phantom worry could be a problem for some users.