The Nyos 300 has been up and running for about a month now. I wanted to go with an external overflow for this build. First impressions are the Aquarium, sump and stand are very well made. The seams on the tank are perfect. The navy background in quite nice...it's an extremely dark blue...almost black. The other reason I went with Nyos was to get away from the membrane drain valves...previous 4 builds have been RedSea. Nyos had switched to a ball valve late last year. Unfortunately my system came with the membrane wheel valve. I reached out to Nyos and Aperture to get the updated valve...no response other than thanks for contacting us, we'll get back to you. Once I filled the tank I noticed a bubble in the front pane...middle of the tank so it's constantly in viewing. I reached out to Nyos and Aperture about the bubble...same lack of response. I'm ordering the 32mm parts to swap to the main drain ball valve. Again the system in general is very nice and at a decent price point...the lack of customer service is just the norm I guess.