Poor resolution screen, but can be fitted and removed in seconds. It gives the options of a swivel screen when needed.
Fitted, it makes the camera a clumsy lump to use and put in its case. It's also flimsily built: I had to take it apart and fit small bolts to secure it to the hot-shoe fitting when this became loose.
Can also be used as a remote shutter release with the longer lead (provided) fitted.