We have used this for a few vacations. It works with our 10-gallon tank, but needs a little clearance and testing to confirm that food falls into the tank. It is a slam dunk with larger tanks where you can position the port facing the back of the tank.
Keep the owners' manual with the feeder in the same bag so you don't lose it. The user interface is not intuitive so the manual is a must.
Would buy again.