if you have the skill to use the 560 IV on camera in manual then fantastic. you can also use it to control other 560III/IV flash off camera as well as a master TX style controller. it also can be used as a slave off camera for studio lighting. in other words its an excellent flash. you can use a cheap 40 buck battery pack and get 1 second recycle in 1 second flat. only thing its missing to be a perfect manual flash is HSS.
build quality is excellent, lcd is excellent and the buton layout is very easy to use. I own/ed many flashes and I prefer the 3r party flashes more than the 4 nikon flashes I have. I have 2 sb800 1 sb700 and 1 sb900 and going to sell them all to go with shanny/yongnuo flashes exclusively