i have both the maxi-jet 1200 and the Koralia 4. the Koralia 4 is way better by far!! wayyyy more GPH and its magnetic! its reliable too. the maxi-jet 1200 is noisy and the impeller is crap on it. im too lazy to take a photo but its like getting thinned out by the rotations. maxi jet is good however cuz it has the under gravel filter add on and the bubble maker add on. but even if there was no problems at all with the maxi jet, the koralia 4 would still be better cuz its output is incredible!! 1200GPH!!!!