At this point i prefer the 8-1. Just seems like it was producing more but not by much. I think I was really expecting the recirc to blow the ER out of the water and it has not thus far. As I stated my nutrient/bio load is quite small.
Build quality on both is excellent. This is not a cheaply built skimmer as far as I can tell. The ease of use is comparible. I would prefer a gate valve but I should be able to convert if needs be.
Another note, mine did not come with the silencer. This is a KEY component as it makes a lot more noise than my ER. I just stuck my air line through the wall, under the house. Silent.
Overall, I am happy with the purchase, I just dont know if it was really necessary.
Another question: can someone explain why a recirculating skimmer needs only 1-1.5 times the tank volume for the feed pump. I am running about 4x for the feed. I wonder if that is limiting my production?