Nice Compact size, focus nob is toward front which results in using middle or ring finger for focusing and index finger for zooming. Takes some getting used to. Eyeglass wearers may find it difficult to use, i.e., finding a good spot where both left & right images come completely together. Image becomes darker as zoom in. Not suitable for use in low light conditions (dawn or dusk) at middle to full zoom. I predominantly use them to spot arrows when shooting target archery. It's light weight, size and limited view field are ideally suited for this purpose.