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Ive just purchased a pre-owned NW-150 last week. Before this I have used Bubble Magus(BM) skimmer. What I can say is that the RO is as good as the BM. And the RO nw-150 should be able to suit your tank capacity. I am using it on my 322 tank + sump which is around 400L.
Good points:
1) Fine bubbles
2) Good skimmate
3) Small size
4) Easy to clean the skim cup
Ugly point:
1) The way you adjust the water level. It is quite troublesome shifting the telescoping tube up and down.