That is the smallest version of the Super Skimmer and it does a good job for the bioload and the amount that I feed. I used the same model as a hang-on-back on my last tank and had all sorts of issues with it. It would never keep a constant water level in the reaction chamber, venturi would get clogged by salt, the list goes on and it was constant tinkering. I thought and researched all sorts of DIY's to make it better and when I set up this tank I was able to turn this into a decent skimmer. By cutting some holes and using a few uniseals I ran a line from the overflow to feed the skimmer and configured the pump so that it recirculates water over and over. This allowed me to control the flow not by how many GPH the pump turned over but by how much I wanted to let through from the over flow. I also bored out the air inlet on the venturi to allow more air to be pulled in. I ditched the silencer it comes with and attached the airline to the skimmer lid, much quieter.
There are better skimmers out there but they have a price tag. With some work you can be satisfied with it.