Definitely agree that ghost buttons is the new rising trend in visual design but we need to consider its cons as well while using,
Ghost buttons can fall too far into the background and frustrate users. Not all users may be design savvy; some may have trouble identifying an non-traditional button style and knowing how to use it.
Ghost buttons can be tricky to use over images with highly contrasting or varying colors. Typically these buttons are white or black. If you have an image with alternative black and white spaces, a ghost button can be near impossible to see or read.
Ghost buttons rely on size and placement for ease of use. Be cautious when placing the button so that it is easy to find and does not cover a key part of your image.
Ghost buttons can sometimes overpower the image they are paired with.
Ghost button text is more complicated than click here. The words used in these buttons needs to be clearly thought out out, edited and placed in context with the rest of the design.