Not sure about the 9020, but I do have a 9010. The tank isn't complety set-up yet though, so I'll have to get back to you on whether or not it is a good skimmer. From what I've heard though, the Tun e skimmers seem to be a good mid-range skimmer, but by no means a Bubble King skimmer or something like that.
Sorry I couldn't be more helpful