It's good if it works. It will show the depth, bottom shape, stuff between the bottom and surface, and stuff on the bottom. That is pretty much what any sonar unit will do. It has several zoom features that newer lower cost units do not have. Newer units will have a higher definition display and maybe more bells and whistles.
The brand is LOWRANCE (as shown on the bottom left) and the " L° " logo , and the style is LCG (liquid crystal graph) RECORDER as shown on the top left of the picture.