Ive always used fluval canisters, but since i got the 180 im loving my sump. Only downside to it is that it takes water from the top not the bottom, so im using wavemakers to keep the crud in the water column so it can be filtered out. Mechanical is so easy in a sump with socks and theres tonnes of room for bio (or chemical if you need it. You can also hide your heaters!