The feeder is easy to assemble and works great. Timer and readout are clear and quick to set up. The only negative thing about this product is the design of the clamp. It didn't fit on the aquarium edge (it has to be forced on, if you want the clamp to work, but mine did not) and the foam sticky pads were not secure and could not hold the weight on to the light panel top, so it fell in the water! Too bad, otherwise a good product. I bought another timer from a retail store and that timer uses a better screw on clamp (it fits snugly and easily mounts on the edge) but it's not a digital readout and the timer is not adjustable, but it works.