I have a Red Sea rsk 300 and its terrible. Constant inconsistent skimming and over fills all the time. Never had this problem with a dc version skimmer till I upgraded. Or thought i did.Wish could say the same about my bubble magus skimmer. It needs constant adjustment.
Gotta love the fact they want you to buy a dc pump to make them work correctly.
And saying that i like some red sea products. I thing the reefwave and reefdose are awesome. I also use the red sea supplements.