There are many used options for 10gbit, but none come in the right package and with this kind of UI as this ES-16-XG. I have it running at my desk, quiet and cool with low power use, nevermore confined to the basement. Twinax compatibility is hit or miss, but looks as though any Cisco- compatible SFP+ for fiber has worked great - no issues and I tried many just to see. The UI is excellent, modern, feature rich. At this price, even retail, this is worth the money!