Huge deltec fan here! Been usng then since my first apf 600 years ago to my newest tc 2560.
I also have an sc 3070s. I was extreemly sceptical of the new line. Thinking. How could that tiny amount of bubbles possibly match the massive chamber on the 902 or 1004. I couldn't grasp it because I was in bigger is better mode. Well let me say that I was and am still blown away by their performance. In fact I ended up taking the 3070s off my 800 gall system because it was too powerful. Unless you have over 1200 gallons or more and tons of fish you probably don't even need to go that big. I am running a 2560 on 800 and its a perfect match in my opinion .
However. I am sad that deltec pulled out of the U.S. market and had to go through a couple hoops to get mine but I camt see myself ever using another skimmer!
If you asking weather they work the answer is a resounding yes . if you asking do the work well then again I say yes x 1000. The new line's compact size efficiency and performance is unmatched! I honestly love these skimmers. Hoping they come back some day lol
here's a pic from last year of there 3070s about three weeks after i got it.