Easy to clean.  8 oz. capacity is enough - I wouldn't want one with less capacity.  Suction cup has never failed to hold (I leave the suction cup on the window glass and just unhook the feeder from it to clean/refill, then return to the suction cup.  Broke one of these a few years ago by pressing the locking tab on the clear plastic container too far, but I see they now added a bar that prevents this from happening.  Perch is removable.