Depends which model. The ones with micron filter cartridges could be a pain because those basically need to be bleached to clean them. That's kind of a tedious process made worse due to the fact that those cartridges are a lot bigger than, say, those of a Magnum 350.
I use the polybead filter which is excellent. In conjunction with UV, it gives me crystal clear water. It does mechanical and biological filtration and maintenance is amazingly easy because you simply backflush it. In essence, you clean the filter the same time you drain it (during a water change). The backflush water is quite filthy at first. After a few years of use, I opened the thing up and there was no gunk build up. You basically never have to open it up to clean the media. Just turn the pump off, attach the drain hose, flip some valves, turn the pump back on, pump out as much water as you want to remove from the tank and you're done.
A lot of pond/aquaculture filters use beads or sand. This is the only filter of that type small enough for home aquariums.
You do need a separate pump and also have to figure out the plumbing as they don't come with intakes or nozzles, etc.