I've had all three, sumps cans/internal, hob, and for canisters I stick behind eheims. I love their pro 3 models (all of them) and their 2260/62. I have had good luck with their pro 2s as well even though they seemed to be the model of highest failure. Cans are good, they have a good media capacity as well as mechanical capacity. They are not that bad to clean, people make it sound far worse then it actually is. I've had more problems cleaning HOB filters then canisters. They are designed for easy use with their quick connect shut off valves and their latches that hold the pump down. The only down fall to cans is they have to be assembled perfectly after cleaning or else they will leak but you should always keep them in a rubber made anyways. One eheim I had leaked constantly so I kept taking the lid off and putting it back on making sure it was perfect. Finally I realized there was a little pebble in the o-ring area that was causing the leak. Sumps are still the best. Huge bio capacity huge mechanical capacity 100% fail proof unless the sump tank leaks and 100% custom.