2 of my tanks are juwels and still use the internals that came with them, although i have upgraded the pumps to 1500ltr/hr, also have an extra internal on both of them, just as additional filtration/ water movement.
on my 2m tank, i have an FX5 that came with it, and an extra tetra tec ex1200 for extra filtration, wanted to get as much flow and filtration as i could without going totally silly