I use internals a bit because i'm quite restricted on what filters i can use. I have 2 1000L/hr ones with spraybars. They also have a little container in them for carbon (which i dont use), but i have filled them with ceramic rings. But i dont find them hard to clean, maybe hardER to clean than a HOB, but easier than a canister (i also have 2 canisters on the same tank). Cleaning is basically the same as a HOB, i just take the whole filter out, take it apart and clean the sponge in used water. I find it does a great job at mechanical filtration because every week when i clean it it has heaps of gunk in it! But it never goes in the tank, because i take the whole thing out, i dont break it apart IN the tank, then you'll find you'll have gunk going everywhere.
The only problem i find is that they produce ALOT of current. I've only found 1 brand that sells them with a spray bar, and it works magically