I have the 4tb Nano3 Canaan miner- it was good value at USD$99 but they stopped selling the Nano3 and now they sell the 6tb Nano3S at USD$249 - not such good value imo though maybe more efficient. The Nano3 is very quiet on the lower 2.2tb setting- quite noisy on the highest setting. https://www.canaan.io/avalonhome