I have an aes in my tank, its very quiet unless I accidentally put the cup back on improperly. I have to remove the tubing from the side to make it work and so there is no adjustment except for the air control., because of this it is a very wet skimmate. I also find it difficult to remove the cup quite often as it sort of sticks. I took some 5000grit sandpaper and smoothed it out as the mold lines really accentuated the problem. Even still i have accidentally disassembled the entire unit twice trying to get the cup off.
I will say that even with the problems it shouldn't be discounted as it does the job intended. My son even dropped a crayola marker in and it removed the dye from the water quickly. I should have taken a pic of the crystal blue water that came out.
I have not watched the others in action so I can't speak for them but the ability to open the tank top without messing with it is very nice