Hi Everyone,
The Extreme line is still a good skimmer. I think Octopus is just trying to improve there skimmer line and have tried a few different methods. The extreme smaller line basically grew into there big PRO models, which seem to be really good.
I would imagine from a manfuacture stand point, they found the standard NW and DNW was a better fit for production and didn't see the performance advantages on the smaller extreme.
This is just my opinion (guess), but I know Octopus really wants to put out a quality product and has just taking some time to find what works best for them.
There only flaw I think has been they changed models way too fast, but if you look at say EuroReef and go back on there history, you'll find they made design changes almost every year or couple of years. So over coarse of time, they redesigned there skimmer many times, always trying to improve, but that didn't mean there previous models were not good. They just wanted to make them better.