It ideally replaces the built-in flash DSLR SLT by offering a greater range and the possibility of indirect lighting. This is very convenient when shooting indoors in low light, you come to correctly expose the whole scene. The battery life is important for non-professional use, it can keep a year.
The negative point is the exposure adjustment, which is not always easy to achieve due to the lack of information on the flash. It requires experiential learning.
